Millwall players were pelted with missiles after they went ahead for a second time at Elland Road — in an incident that could mean punishment for Leeds.
Defender Jake Cooper appeared to be struck by an object during celebrations in front of the South Stand after Ben Marshall converted a 55th-minute penalty.
Stewards removed objects from the pitch, including a bottle, and Millwall manager Neil Harris said: ‘I saw the missiles. Nobody at either club would condone fans throwing stuff on the pitch.’
Ben Thompson gave Millwall the lead after 10 minutes before Patrick Bamford had his penalty saved by Lions goalkeeper David Martin, but Pablo Hernandez levelled the score before half-time.
Ben Marshall restored the Lions's advantage from the penalty spot, but Luke Ayling's header restored parity before Hernandez stabbed in with seven minutes to go.
Crowd trouble has marred a number of Championship games this season and the FA started an investigation after a Birmingham fan attacked Aston Villa’s Jack Grealish earlier this month.
