Mikel Arteta's Gunners were top of the tree at Christmas for a second successive year but trail leaders Liverpool by two points at the halfway point of the season.

Last year's runners-up dominated possession at the Emirates but lacked a cutting edge against the disciplined visitors, for whom Tomas Soucek and former Arsenal player Konstantinos Mavropanos scored the goals.

Soucek opened the scoring from close range in the 13th minute following a pass from Jarrod Bowen, with the goal confirmed after a lengthy VAR check looking into whether the ball had gone out of play.

Arsenal surged forward in relentless waves and West Ham goalkeeper Alphonse Areola made a fine reaction save from a Bukayo Saka header on the half-hour.

The England winger hit the post from a tight angle as the clock ticked down towards half-time but Arsenal trailed at the break despite enjoying nearly three-quarters of possession.

The Gunners came out determined to find a response but instead they found themselves 2-0 down when Mavropanos's bullet header cannoned in off the crossbar from James Ward-Prowse's corner.

Gabriel Jesus failed to beat Areola with a header when well-placed and shortly afterwards missed another glorious opportunity with his head at the back post.

Arsenal continued to bombard the visitors' goal but could not find a breakthrough and it could have been worse had Said Benrahma managed to convert a late penalty.

Defeat leaves the Gunners in second place on 40 points, one clear of Aston Villa and three ahead of Manchester City, who have a game in hand.

Arteta said his team deserved more for their dominance.

"We want to be at the top and today we are very, very disappointed," he told the BBC.

"We had so much dominance in the game. We are in a really good position. Today is a disappointing night. We have to pick ourselves up for a big game against Fulham."

He added: "The players put an enormous effort in. It's a difficult dressing room right now but we have another game in 72 hours. This is football, we have to improve in certain areas."

West Ham manager David Moyes celebrated his team's rise to sixth in the table.

"We are not one of the top teams," he told Amazon Prime. "We are trying to get up and grow the team. For West Ham to be in Europe (they topped their Europa League group) is a great period."