Arsenal's 10 match unbeaten league run is over as they fell to a home defeat to Swansea.
They were beaten 1-0 by Swansea at the Emirates. Bafetimbi Gomis scored the only goal five minutes from time with a header.
Defeat leaves Arsenal third, three points behind second-placed Manchester City - but with a game in hand.
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Swansea stay eighth, but are now just a point behind Southampton as they make a late charge towards a Europa League place.