Arsenal failed to hold on to a lead once again, conceding an injury-time equalizer as it was held to a 1-1 draw at Vitoria in the Europa League on Wednesday.

Arsenal labored throughout the game in driving rain and did not have a single shot on target until Shkodran Mustafi headed home a free kick by Nicolas Pepe in the 81st minute.

But Bruno Duarte leveled with an overhead kick after the Gunners failed to clear a cross into the box — the fourth game in a row in all competitions that Unai Emery's side has given up a lead.

Arsenal's Shkodran Mustafi, center, scores the opening goal during the Europa League group F soccer match between Vitoria SC and Arsenal at the D. Afonso Henriques stadium in Guimaraes, Portugal, Wednesday, Nov. 6, 2019. (AP PhotoLuis Vieira)

Arsenal's Shkodran Mustafi, center, scores the opening goal during the Europa League group F soccer match between Vitoria SC and Arsenal at the D. Afonso Henriques stadium in Guimaraes, Portugal, Wednesday, Nov. 6, 2019. (AP PhotoLuis Vieira)

Arsenal remained top of Group F with 10 points from four games, while last-place Vitoria earned its first point of the campaign.

The unusual kick-off time of 3:50 p.m. local time on a Wednesday led to the game being played in a half-empty stadium. The match was moved from the Europa League's usual Thursday schedule to avoid having two games in the same region on the same day, which puts a strain on security resources. Vitoria's stadium is close to local rival Braga, which hosts Besiktas on Thursday.

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Arsenal's Joe Willock reacts during the Europa League group F soccer match between Vitoria SC and Arsenal at the D. Afonso Henriques stadium in Guimaraes, Portugal, Wednesday, Nov. 6, 2019. (AP PhotoLuis Vieira)

Arsenal's Joe Willock reacts during the Europa League group F soccer match between Vitoria SC and Arsenal at the D. Afonso Henriques stadium in Guimaraes, Portugal, Wednesday, Nov. 6, 2019. (AP PhotoLuis Vieira)