Gunners finally end winless streak
West Ham 1 Arsenal 3
Arsenal hit three quickfire goals to seal a 3-1 comeback victory at West Ham and end a nine-match winless run in the process.
The Gunners looked on course for yet another defeat as they fell behind to a fortunate Angelo Ogbonna goal at the London Stadium - but they rallied after the break to record a fairly comfortable victory.
It was the first win under the guidance of interim head coach Freddie Ljungberg, who was rewarded for starting Gabriel Martinelli and Nicolas Pepe as both got on the scoresheet before Pierre-Emerick Aubameyang added the third.
While Arsenal supporters booed their team off at the break, it was the West Ham fans who flooded out of the stadium early as Manuel Pellegrini continues to hang onto his own job.
After a draw at Norwich and a home defeat to Brighton, Ljungberg needed a response here and it finally came on the hour. Until then this was a London derby with a distinct lack of quality or intensity, with Bernd Leno saving well from fit-again Michail Antonio the only real chance before the Hammers hit the front.
Arsenal could not clear their lines from a corner and Ogbonna shouldered the ball goalwards before it cannoned off Ainsley Maitland-Niles - called in at the last minute after Hector Bellerin was injured in the warm-up - and into the net.
After the break, Martinelli hit his first Premier League goal on his first start in the competition as he steered in Sead Kolasinac's cross and six minutes later Arsenal were ahead.
Aubameyang spread the ball out wide to Pepe and the club-record signing needed no second invitation to curl home a fine finish before celebrating in front of the visiting fans.
The Ivory Coast international then provided the assist for Aubameyang, who was just onside as he hit a crisp volley past David Martin to take Arsenal up to ninth in the table.