Arsenal came from behind to beat their north London rivals Tottenham 2-1 and close to within four points of league leaders Liverpool.
Son Heung-min stunned the Emirates by firing Spurs in front with the aid of a deflection, but Arsenal hit back with two goals in four minutes to take a lead into the break.
Gabriel's header deflected off Dominic Solanke to bring the Gunners level, before Leandro Trossard fired past Antonin Kimsky with his weaker left foot.
Arsenal had more chances to put the game to bed, but their profligacy in front of goal was an issue once more, which led to a nervy finish.