Arsenal fans' "No contract Wenger out" banner flies over stadium
Craig Dawson opened the scoring for West Brom before Alexis Sanchez drew Arsenal level.
But Hal Robson-Kanu put the Baggies back in the lead before Dawson grabbed his second of the afternoon to seal the 3-1 win.
Arsenal struggled to defend West Brom's set-pieces during the match.
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Arsenal boss Arsene Wenger was disappointed with the defeat to West Brom
And Wenger admitted his side have to take responsibility for their poor performance.
"It’s a big disappointment when you lose a game like that," Wenger told Sky Sports.
"We all have to take responsibility and prepare for our next games.
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Craig Dawson scored twice for West Brom against the Gunners
"We work on the same system in every single game.
"Their deliveries are absolutely fantastic and their movement is good.
"We were guilty especially on the second goal but they score against anybody from set-pieces."
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