Fresh violence broke out in Belfast today after police carried out a series of raids in the loyalist north of the city.
A car was hijacked, set on fire and left blocking the Crumlin Road, and a van was hijacked and burned on the Ballygomartin Road.
The hijackings came as police searched a number of houses in the Highfield area in the hunt for those behind three-days of street violence following a controversial Orange march on Saturday.
One person was arrested, said a police spokeswoman.
Highfield is where the Police Service of Northern Ireland (PSNI) said it discovered a bomb-making factory at the weekend. It is also the home district of a man who appeared in court following the violence charged with possession of seven guns and bomb-making equipment.
Ulster Unionist Party leader Sir Reg Empey met Northern Ireland Secretary Peter Hain at Stormont to discuss the violence and urged him to get out on the streets of the city to gauge loyalists' feelings.
Sir Reg said: "There is no point in confining his meetings to opinion-formers or the great and the good of this country. He has to get out on the ground and see for himself and we have made specific invitations to him today to do so."
Mr Hain should have engaged directly with the communities at an earlier stage, said Sir Reg.
"He must listen to their concerns and enter into dialogue with opinion-formers at a grass roots level. He must understand that the sense of alienation felt by ordinary unionists is profound," he added.
Sir Reg said he also raised unionist concerns over the "dangerous political vacuum", and the plans of the British and US governments to hold a policing conference early in the new year. Unionists fear the conference is the forerunner to fresh policing reforms - despite denials from both governments.
Mr Hain was also meeting Democratic Unionist leader the Rev Ian Paisley and Alliance leader David Ford.
PA