A number of seats were damaged by Newcastle United fans at the Stadium of Light last night.
The club's Under-23 side beat Sunderland 11-10 in a penalty shootout after the two sides drew 2-2 after extra-time.
Newcastle were backed by around 300 fans for the Premier League International Cup quarter-final.
And several seats were broken by visiting supporters after Lynden Gooch put Sunderland 2-1 ahead in the second half.
Callum Roberts scored an injury-time equaliser for United to take the game into extra-time.
There was a small police presence inside the stadium for the game, which was the first reserve derby in four years.