Substitute Thierry Henry marked the final league game of his loan spell at Arsenal with a last-gasp winner to see off Sunderland 2-1.
The Frenchman struck in injury-time to claim the points after fellow replacement Aaron Ramsey had cancelled out the home side's lead on an eventful afternoon on Wearside.
James McClean had opened the scoring in the 70th-minute with Gunners defender Per Mertesacker, who had survived a first-half penalty appeal for handball, lying in a heap after catching his studs in the turf.
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