West Ham came from behind to dent managerless Burnley's hopes of avoiding relegation from the Premier League in a match tainted by Ashley Westwood's injury.
Tomas Soucek equalised from close range to cancel out Wout Weghorst's opener as West Ham extended their unbeaten home run to eight games in all competitions.
Both sides started with attacking intent but the game took a turn for the worse when Westwood was stretchered off with a worrying leg injury after what looked like a innocuous challenge with Nikola Vlasic.
Play was stopped for eight minutes with medical staff from both clubs attending to the Burnley midfielder.