Ralf Rangnick condemned the behaviour of some Leeds fans after Anthony Elanga was hit by a missile as he celebrated scoring Manchester United's third goal.
The United players were also targeted as they celebrated Harry Maguire’s opener and at half-time and Rangnick went on to the pitch to act as peacemaker when there was a melee.
"As far as I know, there is some investigation going on from Leeds United," said the United boss.