Olivier Giroud scored Arsenal's opener at the Emirates
Olivier Giroud rounded off the best move of the game to fire the Gunners into a deserved lead.
Aaron Ramsey bagged his first goal since December when he side-footed Giroud's lay-off past goalkeeper Adrian, before Mathieu Flamini tapped in to complete the rout.
Theo Walcott, Alexis Sanchez and Giroud all saw first-half chances parried by the stopper, who had a fine game between the Hammers sticks.
Matt Jarvis, meanwhile, wasted West Ham's best chance as he blazed a volley from a corner over the crossbar.
The win puts four points between Arsenal and fourth-placed Manchester United, who play tomorrow, while Arsene Wenger's men draw within a point of Manchester City in second.
As for West Ham, defeat keeps the club 10th in the Premier League.
Olivier Giroud rounded off the best move of the game to fire the Gunners into a deserved lead.
Aaron Ramsey bagged his first goal since December when he side-footed Giroud's lay-off past goalkeeper Adrian, before Mathieu Flamini tapped in to complete the rout.
Theo Walcott, Alexis Sanchez and Giroud all saw first-half chances parried by the stopper, who had a fine game between the Hammers sticks.
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Matt Jarvis, meanwhile, wasted West Ham's best chance as he blazed a volley from a corner over the crossbar.
The win puts four points between Arsenal and fourth-placed Manchester United, who play tomorrow, while Arsene Wenger's men draw within a point of Manchester City in second.
As for West Ham, defeat keeps the club 10th in the Premier League.
