Leaders on both sides of the political divide have appealed for calm after clashes between nationalists and loyalists on the peace line in west Belfast.
Three RUC officers were injured as crowds of up to 300 gathered on different sides of Springfield Road in Lanark Way on Tuesday night.
Tensions are rising in the area in advance of an Orange Order march on Springfield Road on Saturday and following the UFF's threat to end its ceasefire.
One police officer received 11 stitches after being hit on the head with a stone. Two other officers sustained minor injuries. Police and community representatives intervened throughout the night in an attempt to restore order.
However, the crowds continued to throw bricks and bottles and to shout obscenities at each other.
Ulster Unionist councillor Mr Chris McGimpsey claimed the disturbances were provoked by nationalists.
"A series of protests have been staged by nationalists this week to try and get Saturday's parade banned. These constant attacks on Protestants living on the peace line are designed to increase tension. I appeal for people to remain calm."
However, Sinn Fein councillor Mr Tom Hartley accused loyalists of raising tensions.
"Nationalists have simply been involved in a series of peaceful protests on the Springfield Road against the Orange Order march planned for Saturday."
He urged the North's Parades Commission to reverse its decision to allow Saturday's parade. Mr Hartley also claimed that the UDA was involved in the disturbances.
"It is clear that the appearance of a large crowd of loyalists on Tuesday night was organised and orchestrated by the UDA.
"It came in the wake of their threat to kill Catholics living in interface areas and was clearly part of an attempt to intimidate the local community."