A Washington-based Syrian watchdog says thousands of documents collected from abandoned Syrian government offices reveal the reach of President Bashar Assad's security agencies, offering a rare glimpse into the inner workings of his secretive apparatus.

The documents include handwritten notes from top commanders to "do what is necessary" to quell anti-Assad protests.

The Syria Justice and Accountability Center says the documents show officials at the highest level were either aware or involved in the bloody crackdown since 2011.

FILE - In this Dec. 21, 2011 file photo, anti-Syrian regime protesters flash the victory sign as they wear Syrian revolution flags during a demonstration in the Baba Amr area, in Homs province, Syria. The Syria Justice and Accountability Center, a Washington-based Syrian rights group said in a report, released Tuesday, May 21, 2019, that thousands of documents collected from abandoned Syrian government offices reveal the reach of President Bashar Assad's security agencies, offering a rare glimpse into the inner workings of his secretive apparatus. The documents include handwritten notes from top commanders to "do what is necessary" to quell anti-Assad protests. (AP Photo, File)

FILE - In this Dec. 21, 2011 file photo, anti-Syrian regime protesters flash the victory sign as they wear Syrian revolution flags during a demonstration in the Baba Amr area, in Homs province, Syria. The Syria Justice and Accountability Center, a Washington-based Syrian rights group said in a report, released Tuesday, May 21, 2019, that thousands of documents collected from abandoned Syrian government offices reveal the reach of President Bashar Assad's security agencies, offering a rare glimpse into the inner workings of his secretive apparatus. The documents include handwritten notes from top commanders to "do what is necessary" to quell anti-Assad protests. (AP Photo, File)

The group analyzed a sample of 5,000 documents from nearly half a million obtained in 2013 and 2015 from several Syrian provinces after government forces withdrew.

Its report, released on Tuesday, offers evidence of government violations of the laws of war. Director Mohammad Al-Abdallah says they may be used for criminal prosecution.

FILE - In this March 23, 2011 file photo, anti-Syrian government protesters flash Victory signs as they protest in the southern city of Daraa, Syria. The Syria Justice and Accountability Center, a Washington-based Syrian rights group said in a report, released Tuesday, May 21, 2019, that thousands of documents collected from abandoned Syrian government offices reveal the reach of President Bashar Assad's security agencies, offering a rare glimpse into the inner workings of his secretive apparatus. The documents include handwritten notes from top commanders to "do what is necessary" to quell anti-Assad protests. (AP PhotoHussein Malla, File)

FILE - In this March 23, 2011 file photo, anti-Syrian government protesters flash Victory signs as they protest in the southern city of Daraa, Syria. The Syria Justice and Accountability Center, a Washington-based Syrian rights group said in a report, released Tuesday, May 21, 2019, that thousands of documents collected from abandoned Syrian government offices reveal the reach of President Bashar Assad's security agencies, offering a rare glimpse into the inner workings of his secretive apparatus. The documents include handwritten notes from top commanders to "do what is necessary" to quell anti-Assad protests. (AP PhotoHussein Malla, File)

 FILE - In this March 21, 2011 file photo, Syrian policemen stand in front of a court building that was set on fire by Syrian anti-government protesters, in the southern city of Daraa, Syria. The Syria Justice and Accountability Center, a Washington-based Syrian rights group said in a report, released Tuesday, May 21, 2019, that thousands of documents collected from abandoned Syrian government offices reveal the reach of President Bashar Assad's security agencies, offering a rare glimpse into the inner workings of his secretive apparatus. The documents include handwritten notes from top commanders to "do what is necessary" to quell anti-Assad protests. (AP PhotoHussein Malla, File)

FILE - In this March 21, 2011 file photo, Syrian policemen stand in front of a court building that was set on fire by Syrian anti-government protesters, in the southern city of Daraa, Syria. The Syria Justice and Accountability Center, a Washington-based Syrian rights group said in a report, released Tuesday, May 21, 2019, that thousands of documents collected from abandoned Syrian government offices reveal the reach of President Bashar Assad's security agencies, offering a rare glimpse into the inner workings of his secretive apparatus. The documents include handwritten notes from top commanders to "do what is necessary" to quell anti-Assad protests. (AP PhotoHussein Malla, File)
FILE - This April 18, 2017 file satellite image provided by the State Department and DigitalGlobe, shows what the State Department described as a building in a prison complex in Syria that was modified to support a crematorium. The Syria Justice and Accountability Center, a Washington-based Syrian rights group said in a report, released Tuesday, May 21, 2019, that thousands of documents collected from abandoned Syrian government offices reveal the reach of President Bashar Assad's security agencies, offering a rare glimpse into the inner workings of his secretive apparatus. The documents include handwritten notes from top commanders to "do what is necessary" to quell anti-Assad protests. (State DepartmentDigitalGlobe via AP, File)

FILE - This April 18, 2017 file satellite image provided by the State Department and DigitalGlobe, shows what the State Department described as a building in a prison complex in Syria that was modified to support a crematorium. The Syria Justice and Accountability Center, a Washington-based Syrian rights group said in a report, released Tuesday, May 21, 2019, that thousands of documents collected from abandoned Syrian government offices reveal the reach of President Bashar Assad's security agencies, offering a rare glimpse into the inner workings of his secretive apparatus. The documents include handwritten notes from top commanders to "do what is necessary" to quell anti-Assad protests. (State DepartmentDigitalGlobe via AP, File)