West Brom stopped Arsenal from closing the gap on Chelsea at the top of the Barclays Premier League with a 3-2 victory over the Gunners at the Emirates.
Three second-half goals from Peter Odemwingie, Gonzalo Jara and former Arsenal player Jerome Thomas put Albion in front before Samir Nasri scored two late goals for Arsene Wenger's side.
It was Arsenal's first home defeat since they lost to Manchester United last January and kept them four points adrift of leaders Chelsea, while Albion moved-up into fifth place.
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