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In a statement released tonight the PSNI claimed the blast bombs were thrown by masked men in the Lower Newtownards Road area.
"The blast bombs thrown in the east Belfast area earlier this evening were thrown by masked men from the area of Pitt Park at police lines on the Lower Newtownards Road," a spokesman said.
Democratic Unionist Party MLA for North Belfast William Humphrey described the pipe bomb attack as an attempt to kill.
Theresa Villiers, Secretary of State for Northern Ireland, also condemned the "deplorable attack" on police officers.
The Police Service of Northern Ireland has closed a number of roads in Belfast after bombs were thrown at officers in a fourth night of protests.
An improvised explosive device was hurled from the nationalist Brompton Park area of Ardoyne and exploded after striking an armoured police vehicle just after 5pm.
There were no reports of any injuries.
Witness Sam Coulter, who was yards from the explosion at a loyalist protest, said it was fortunate no one was hurt.
Four improvised 'blast bombs' and a pipe bomb packed with nails have been thrown towards police lines in north Belfast.
Violence has erupted in east Belfast with at least four improvised explosive devices thrown at police.
Several petrol bombs were also hurled after disturbances broke out but there were no reports of any injuries, the Police Service of Northern Ireland said.
At least one plastic bullet was fired and water cannons have been deployed to quell the disorder.
It is the fourth consecutive night of trouble in parts of Belfast.
Police have warned that more people are expected to be arrested once video footage is analysed, as riots continued in Belfast for a third successive night.
At least six petrol bombs and other missiles were thrown at police on Sunday night.
Cars along with industrial bins were also set alight in north Belfast as clashes continued.
The Police of Northern Ireland said one officer had been injured in the riots, which stem from a decision to ban a Orange Order parade passing through the nearby republican Ardoyne area.
A special sitting of Belfast Magistrates' Court was held yesterday with plans in place to keep courts open if clashes continue.
Loyalist protesters have attacked police for a third successive night in Belfast.
Trouble again flared in the Woodvale Road area in the north of the city as the fall out from a decision to ban a controversial Orange Order parade passing through the nearby republican Ardoyne area continued.
Hundreds of loyalists were involved in a tense stand off with riot police throughout the evening, with disorder finally breaking out around 10.30pm.
Petrol bombs and a range of other missiles were thrown at police, who responded by firing baton rounds.
The Police Service of Northern Ireland (PSNI) said one officer had been injured in the initial clashes.
There is a peaceful loyalist protest ongoing in north Belfast. On the other side of Ardoyne roundabout, a group of nationalists are watching on.
Latest ITV News reports
23 police officers and an MP were among those injured during a night of fierce violence in Northern Ireland.