Seven police officers and two band members have been injured after a Royal Black Institution parade was attacked in Castlederg, County Tyrone.
A Royal Black Institution parade was attacked
It happened on Saturday as marchers returned from a demonstration in Newtownstewart.
As they passed through the nationalist Ferguson Crescent area people came out of a bar and assaulted marchers and police. Four people were arrested.
UUP assembly member Derek Hussey said the attack was "completely unexpected".
"Our local district master, who is 75 years of age, was hit and actually had to be hospitalised, he was taken away in an ambulance," he said.
"Young members of a local pipe band, aged between 10 and 16, were affected traumatically by what went on.
"This has set community relations back in our area - it has set it back 30 years."
Sinn Fein councillor Charlie McHugh said trouble could have been avoided if restrictions had been placed on the march, which had been given the go-ahead by the Parades Commision.
"I'm led to believe that the person who does the report on parades on the ground for the Parades Commission had recommended that the evening parade should not be in Ferguson Crescent, but the Parades Commission allowed it and we now see what has happened," he said.
One of the seven injured police officers was treated for a broken cheekbone.
Two elderly band members were also treated for facial injuries. A banner was also torn during the trouble.