West Ham co-chairman David Sullivan was struck on his glasses by a coin as supporter unrest marred Saturday's Premier League defeat at home to Burnley, according to Trevor Brooking.
After Ashley Barnes opened the scoring, Chris Wood struck twice to secure a 3-0 win for the visitors at London Stadium, with the second half disrupted by a series of pitch invasions.
West Ham captain Mark Noble tussled with one intruder, shoving him to the ground, while another supporter ran on to the field with the corner flag and attempted to plant it in the centre circle.
Unrest was evident in the London Stadium stands, too, as some home supporters turned their anger on Sullivan and fellow co-chairman David Gold.