Northumbria Police confirmed that 21 arrests were made in Sunderland ahead of a friendly football match against Celtic.

The game, at the Stadium of Light on Saturday, was marred by a series of violent incidents across the city.

While it is not known how many Celtic fans were arrested, Police have confirmed that supporters from both sides were involved.

Some fans are due to appear in court on Monday morning.

The majority of arrests were for drunk and disorderly, breach of the peace and the use of illegal pyrotechnics.

Assistant chief constable, Helen McMillan, said: "We did have some incidents of disorder in and around Sunderland between Sunderland and Celtic fans and, while police dealt with them quickly, it's a shame these types of incidents happen at all.

"Fans come here to enjoy the football - many with young children - and we here at Northumbria Police do all we can to ensure they enjoy the day whichever team they support."