BOSTON (AP) — U.S. prosecutors have dropped all criminal charges against a Russian scientist who was tossed into an immigration jail last year after she landed at a Boston airport with frog embryos intended for her cancer research at Harvard Medical School.
Kseniia Petrova, 31, spent four months in detention following her arrest in early 2025 as she returned from a vacation in France, where she had stopped at a lab specializing in splicing superfine sections of frog embryos and obtained a package of samples for research.
She was questioned about the samples while passing through a customs checkpoint at Logan International Airport, then later charged with smuggling.
A federal judge on Wednesday granted a request by prosecutors to dismiss those charges as well as counts alleging that she'd concealed facts and made false statements to government officials.
Petrova told The Associated Press in an interview that she did not realize the items needed to be declared and was not trying to sneak anything into the country.
The case began to fall apart in April, after a federal judge ruled a customs officer improperly canceled Petrova's visa over the incident. Petrova had feared being deported to Russia and imprisoned there.
Her lawyers had also argued that the criminal prosecution was vindictive, saying the government only filed criminal charges after it looked like she would win her immigration case. They also argued that it was rare for anyone to be charged criminally for what Petrova did.
On Tuesday night, U.S. Attorney Leah Foley filed a motion to dismiss the charges “based on developments in this case and an assessment of the office’s priorities and resources.”
“At this stage, the resource costs of continuing this prosecution outweigh the public interest in its resolution,” she wrote, adding that the “defendant’s claims of vindictive and selective prosecution are meritless.”
U.S. District Judge Leo Sorokin, who was nominated by former President Barack Obama, dismissed the charges Wednesday without a hearing.
“The DOJ never should have brought this highly unusual “smuggling” prosecution against Kseniia Petrova, a talented scientist at Harvard,” one of Petrova's attorneys, Daniel Marx, said in a statement. “Ms. Petrova only sought to advance medical research into aging that could benefit everyone, and her handling of scientific samples — inert, non-living, non-toxic, frog embryos — never posed any danger to anyone.”
Earlier this year, the Department of Homeland Security defended Petrova's detention, saying she had lied to federal officers about the frog embryos.
In a court filing asking the judge to dismiss the case, Foley cited an April court ruling that would have allowed Petrova's lawyers to get broad access to government documents as part of her defense that she was being prosecuted selectively.
“The government must supply the defendant with information pertaining to any number of passenger encounters involving undeclared items that could be considered comparable, without regard for the manner in which those items were carried, the presence or absence of planning, or the strength of the evidence of a passenger’s fraudulent intent,” Foley wrote.
FILE - Harvard University researcher Kseniia Petrova departs the John Joseph Moakley United States Courthouse after being released on bail from federal custody on June 12, 2025, in Boston. (AP Photo/Leah Willingham, File)
Real Madrid produced another late comeback in the Champions League as Federico Valverde struck in stoppage time to seal a 3-2 win over AEK Athens on Wednesday.
Liverpool, however, fell to a surprise 3-2 defeat at Fenerbahce on a dramatic night of action, while Manchester City battled to victory over RB Leipzig by the same score after twice blowing leads, and Como beat Lens 9-1.
Last season's runner-up Arsenal beat Slavia Prague 2-1.
Madrid joined back-to-back defending champion Paris Saint-Germain as the only other team to have a 100% winning record after four games played in this season's competition. But that perfect start was put under serious threat in Greece.
The record 15-time European champion twice went behind at Allwyn Arena and needed Valverde's long-range strike in the 92nd minute to seal victory.
"Of course, I prefer to win more comfortably, but these games in the final minutes — only we can win them,” Madrid coach Mourinho told broadcaster Movistar.
Madrid also needed a late rally to beat Roma 4-3 last month, scoring three goals in the last 10 minutes, including a 90th minute winner from Antonio Rudiger.
AEK led through Aboubakary Koita in the first half before Jude Bellingham leveled with a back heel.
Stavros Pilios put the home team 2-1 ahead in the 75th, but Kylian Mbappé equalized three minutes later.
Mbappé then hit the bar before Valverde's dramatic winner.
“The players have courage. I’m very lucky to have players of this quality. Very lucky,” Mourinho said.
Madrid is second in the standings, behind PSG on goal difference.
Liverpool twice blew the lead against Fenerbahce before losing for the first time in this season's Champions League.
Trey Nyoni and Alexander Isak gave the Merseyside club the lead in each half, with former Manchester United striker Mason Greenwood and Archie Brown leveling for Fenerbahce on each occasion.
Vedat Muriqi struck the winner in the 89th as Liverpool fell to back-to-back losses in all competitions following defeat to Arsenal in the Premier League on Sunday.
“The main reason I can find for why we lost this game is we conceded from three set pieces,” Liverpool coach Andoni Iraola said. “We knew it was one of the strengths of Fenerbahce. We concede from a free-kick, a corner and even from the long throw at the end. It’s frustration because it’s a difficult place to come here and play.”
Victory will have been particularly sweet for Fenerbahce interim coach, former Liverpool striker Dirk Kuyt.
Erling Haaland came back to haunt Leipzig and drag City over the line after being pushed to the limit at Red Bull Arena.
The Norway striker has scored 13 goals against Leipzig and came up with the winner in the 78th after City twice failed to hold onto the lead.
First-half goals from Noni Madueke and Viktor Gyokeres put Arsenal on course for victory at Slavia Prague and despite conceding in the 90th, the Premier League champion sealed a 2-1 win.
Tasos Douvikas scored a hat trick and Cesc Fabregas’ Como routed Lens 9-1 to make it three victories in four matches of its debut season in the competition.
Douvikas has scored in all four of Como’s matches.
Nico Paz also found the net and then instead of celebrating went and grabbed a T-shirt featuring an image of Jesús de Miguel, the Tenerife forward who died following an on-field collision with the opposing team’s goalkeeper.
Paz spent time in Tenerife’s youth system from 2014-16.
Napoli coach Massimiliano Allegri was in crisis following a 4-1 loss at Porto.
Gabriel Veiga, Jakub Kiwior and Samu Aghehowa scored in the second half for the hosts after Scott McTominay’s momentary equalizer.
It was Napoli’s third loss in four matches of the league phase; and the Partenopei are struggling in Serie A, too — having been beat 2-0 at Juventus on Sunday.
Porto has a perfect 10 wins in 10 matches to lead the Portuguese league but had lost its opening three matches in the Champions League.
Konstantinos Karetsas’ first goal for Borussia Dortmund gave the 1997 champion a 2-1 win over Real Betis.
The Greek winger entered for the injured Serhou Guirassy with 10 minutes of the first half remaining and was involved in the buildup after the break when Fábio Silva opened the scoring off the rebound from Álvaro Vallés’ save of Jobe Bellingham’s initial effort.
Aitor Ruibal equalized in the 67th to set off wild celebrations among the many visiting supporters.
Vallés pulled off a point-blank save to deny Bellingham an immediate response before he was finally beaten by Karetsas for what proved the winner in the 72nd.
It gave Dortmund three wins from four games.
James Robson is at https://x.com/jamesalanrobson
See AP’s full soccer coverage here
Fenerbahce's Archie Brown, center, celebrates after scoring his side's second goal during the Champions League opening phase soccer match between Fenerbahce and Liverpool in Istanbul, Turkey, Wednesday, Nov. 4, 2026. (AP Photo/Khalil Hamra)
Liverpool's Alexander Isak celebrates after scoring his side's second goalduring the Champions League opening phase soccer match between Fenerbahce and Liverpool in Istanbul, Turkey, Wednesday, Nov. 4, 2026. (AP Photo/Khalil Hamra)
AEK Athens' Stavros Pilios celebrates after scoring his side's third goal during the Champions League opening phase soccer match between AEK Athens and Real Madrid in Athens, Greece, Wednesday, Nov. 4, 2026. (AP Photo/Petros Giannakouris)
Real Madrid's Kylian Mbappe has a shot blocked during the Champions League opening phase soccer match between AEK Athens and Real Madrid in Athens, Greece, Wednesday, Nov. 4, 2026. (AP Photo/Petros Giannakouris)
Real Madrid players celebrate with Federico Valverde after he scored his side's third goal during the Champions League opening phase soccer match between AEK Athens and Real Madrid in Athens, Greece, Wednesday, Nov. 4, 2026. (AP Photo/Petros Giannakouris)
Manchester City's manager Enzo Maresca speakes during a team's press conference in Leipzig, Germany, Tuesday, Nov. 3, 2026, ahead of the Champions League soccer match against RB Leipzig. (Robert Michael/dpa via AP)
Liverpool's manager Andoni Iraola smiles before the English Premier League soccer match between Liverpool and Arsenal in Liverpool, England, Sunday, Nov. 1, 2026. (AP Photo/Jon Super)
Real Madrid's Kylian Mbappe celebrates after scoring the opening goal during the Spanish La Liga soccer match between Racing de Santander and Real Madrid in Santander, Spain, Sunday, Nov. 1, 2026. (AP Photo/Miguel Oses)
Real Madrid's head coach Jose Mourinho watches during the Spanish La Liga soccer match between Racing de Santander and Real Madrid in Santander, Spain, Sunday, Nov. 1, 2026. (AP Photo/Miguel Oses)
