There's been renewed calls for calm in the North, after more rioting broke out on the streets of Belfast overnight.

Nine police officers were injured and 18 people were arrested when crowds of up to 300 people threw petrol bombs, fireworks and bricks at police.

Trouble flared as loyalists held a protest against Belfast City Council's decision to restrict the number of days the union flag can be flown over City Hall.

The SDLP's policing spokesman, Conall McDevitt says the protest organisers must be held responsible for what's happening.