The remains of a pipebomb were disovered in north Belfast in Glencollier Street at around 1.40 a.m. It is believed to have been thrown at around 7.30 p.m. last night.
The discovery followed two pipebomb explosions on Hallidays Road, Belfast.
Sinn Féin councillor Mr Gerard Brophy accused loyalists in the Tiger's Bay district of throwing pipe bombs and claimed it was a miracle no-one had been killed in the almost-nightly deployment of the devices against Catholic targets this year.
"You have to remember these devices have gone into people's houses, have been thrown at people's cars while they were driving them, have been thrown at children," he told BBC Radio Ulster.
"So it's just been a miracle that we haven't been burying people."
Street fighting among rival groups, each of around 100 people, broke out at around 8.45 p.m. in the Serpentine area of the city.
Stones and missile were thrown and one RUC officer was injured by a brick. There were no further injuries reported.
Also in Belfast, an 18-year-old man was shot in the ankles last night while walking near his home. He was bundled into a car and taken to Mica Drive were he was shot.