Published Tuesday, 11 December 2012
The demonstration on the Upper Newtownards Road is understood to have passed peacefully and the crowd later dispersed from the area.
The group marched to the office following a meeting nearby where east Belfast DUP MLA Sammy Douglas and UUP MLA Michael Copeland were in attendance.
The latest protest follows Monday night's attack on police officers guarding the office.
The windows of the unmarked patrol car were smashed by a masked gang of youths and a petrol bomb was thrown inside while a female officer was still in the vehicle.
Police want to speak to anyone who was in the area of Grampian Avenue, Holywood Arches and Ravenscroft Avenue at their junctions with the Newtownards Road between 7pm and 8pm on Monday.
The incident, which was the latest in a series against the party and police, has been described by the PSNI as an "attempt to kill a police officer".
Last week the east Belfast MP received a death threat following a number of demonstrations at the premises.
Meanwhile crowds blocked a number of roads in Belfast on Tuesday evening amid continued protests over the flying of the Union flag.
Police have said all protests have now concluded and areas remain calm.
"A police presence will remain on duty through the evening to provide reassurance and support to local communities," a spokesperson said.
An 18-year-old man was arrested during the evening in connection with a protest in the Crumlin Road. He has been charged with obstructing the highway.
He is due to appear before Belfast Magistrates court on Wednesday.
Traffic was disrupted in the Crumlin Road/Ligoniel Road area where a group of around 20 young people gathered.
A small crowd which gathered at the entrance to the Mount Vernon estate has dispersed and the Shore Road has reopened to traffic.
A crowd of around 70 people, including men, women and children, also gathered on the Donegall Road in south Belfast.
They ignored police calls to move off the road but did step aside at Tavanagh Street to allow an ambulance through.
The Milltown Road in west Belfast and the Oldpark Road in the Ballysillan area of north Belfast was closed for a time due to protests.
Police are also appealing for information after the attempted hijacking of two cars at a protest in the Glendermott Road area of Londonderry. The passengers were not injured but were left badly shaken.
It is the ninth consecutive night of protests sparked by a controversial vote over the flying of the Union flag at Belfast City Hall.
On Monday night 43 separate illegal road blocks took place, with violence breaking out in four areas.
An 18-year-old man has been charged with riotous assembly after disorder in the Village area of south Belfast.
He is due to appear at Belfast Magistrates' Court on Wednesday.
© UTV News