Ulloa struck five minutes into added time overnight, Australian time, to earn a draw for the Foxes, who had looked headed for defeat after West Ham scored twice in three minutes through Andy Carroll’s 84th minute spot kick and Aaron Cresswell’s fine strike to lead 2-1.

Although Leicester manager Claudio Ranieri praised what he called his team’s fantastic performance built on “blood, heart and soul”, the match proved costly for the hosts as they chase a first top-flight title.

Their first-half scorer Jamie Vardy was sent off early in the second and will be suspended for the match at home to Swansea City next Sunday and they dropped points for the first time after five straight wins.

Leicester lead the standings with 73 points, followed by Spurs, who have 65 and play their game in hand at Stoke City today.

Arsenal, who drew 1-1 with visiting Crystal Palace on Sunday, remain fourth on 60 points, behind Manchester City, 3-0 winners at last season’s champions Chelsea on Saturday, on goal difference.

“That was a bad result for us,” Arsenal manager Arsene Wenger said.

“We had a lot of possession but could not turn that into real clear-cut goal chances.

“We lacked a change of pace today, our passing was slow and maybe we lacked complete confidence to go for it.”

A victory over West Ham and defeat for Spurs on Monday would have left Leicester 10 points clear with four games to play.

West Ham almost scored in the second minute when Leicester keeper Kasper Schmeichel saved a header from Cheikhou Kouyate, tipping the ball on to his left-hand post before it rolled across the line and hit the other upright.

Leicester took the lead through Vardy after 18 minutes with the striker grabbing his 22nd goal of the season to join Tottenham’s Harry Kane as the league’s leading scorer.

But Vardy was dismissed for a second yellow by referee Jon Moss and Leicester wilted in the 84th minute when Wes Morgan fouled Winston Reid and Carroll equalised from the spot.

Two minutes later the visitors were ahead thanks to a fierce shot from the edge of the penalty area from Cresswell, before Carroll fouled Jeffrey Schlupp and Moss awarded Leicester a penalty which Ulloa calmly converted.

“The sending off changed our match,” Ranieri said.

“But I never speak about the referee.”

West Ham remained sixth on 53 points, three behind Manchester United as the pair chase a European spot.

Eighth-placed Liverpool, with 10 changes from the side that beat Borussia Dortmund 4-3 to reach the Europa League semi-finals on Thursday, won 2-1 at Bournemouth with goals at the end of the first half from Roberto Firmino and Daniel Sturridge.

Josh King scored a late consolation for the hosts.

-Reuters