Chloe Kelly scored her third and fourth WSL goals of the season
At a glance
Stina Blackstenius opens the scoring for Arsenal after four minutes
Alessia Russo, Chloe Kelly and Beth Mead score in second half
West Ham lose seventh consecutive London derby this season
Arsenal made it eight Women's Super League home games unbeaten as they eased past West Ham at Emirates Stadium.
Stina Blackstenius poked home from Chloe Kelly's cross in the fourth minute as Arsenal got off to the perfect start.
The Gunners missed a host of chances to further increase their lead with Blackstenius, Kelly and Olivia Smith having shots saved by West Ham goalkeeper Kinga Szemik.
Two minutes into the second half, Alessia Russo increased Arsenal's lead when she headed home from Smilla Holmberg's cross.
After 55 minutes, Kelly scored her first WSL goal since October with a strike from the edge of the box that nestled into the bottom corner.
The England international got a second when she pounced on Tuva Hansen's mistake to slot in from close range.
Beth Mead scored to made it five in the 90th minute, latching on to Holmberg's pass and firing past Szemik to compound a miserable afternoon for the Hammers.
There was concern for Eva Nystrom who did brilliantly to stop Blackstenius scoring a second goal but injured herself in the challenge and left the pitch on a stretcher.
The result means Arsenal remain fourth, with two games in hand on the teams above them, while West Ham stay 11th.
How to play
Rate players out of 10 for this game. The rater will close 30 minutes after the final whistle. You must be signed in to a BBC account to play.
Substitutes
Substitutes
After the opportunity to rate players has closed, the score displayed represents the average from all the submissions by BBC Sport users.
