The Independent Monitoring Commission in a special report has blamed the UVF for recent killings, according to well-placed sources.
This will put pressure on the British government to rule that the paramilitary group is in breach of its ceasefire.
The IMC presented the British and Irish governments with its report on the UVF-Loyalist Volunteer Force feud yesterday as violence and serious tensions around loyalist paramilitary activity continues to increase.
In the long-running UVF-LVF feud, the UVF is held responsible for four murders since July 1st and numerous other attacks.
It is also accused by police and politicians of orchestrating serious rioting in north Belfast that was triggered by the arrest of one man and the seizure of a UVF machine gun on Monday.
The weapon, said to be of a Sten-gun type, and other UVF material were seized following a "show of strength" by the UVF in north Belfast on Saturday.
The trouble flared as tensions mount about this Saturday's postponed Orange Order Whiterock parade in west Belfast. It was due to be held in late June but Orangemen held a protest march along the Shankill instead after they were banned from parading onto the nationalist Springfield Road through Workman Avenue.
The Parades Commission ruled that the Orangemen could parade on to the Springfield Road through the old Mackies site, but they said this was unacceptable. The commission has held to this decision for Saturday, which has raised concern that loyalist paramilitaries could try to exploit the parade by further rioting or even attempting to trigger interface violence.
Northern Secretary Peter Hain is today meeting SDLP leader Mark Durkan to discuss the state of the UVF ceasefire and other issues. Mr Durkan in recent weeks accused Mr Hain of appearing to be "indifferent" to recent UVF killings and attacks.
He has called for Mr Hain to adjudicate on whether the UVF ceasefire has been broken. Such calls from nationalist politicians, together with the IMC report - which one source said "points out what the dogs in the streets know about what the UVF is doing" - will reinforce pressure on the Northern Secretary to concede the organisation is off ceasefire.
The IMC cannot specifically instruct Mr Hain to "specify" the UVF, ie rule its ceasefire is no longer intact. "But it will be perfectly clear from the IMC report that it blames the UVF for the recent killings," said one senior source last night.
"There will be nothing surprising in the report," the source added, following another night of loyalist violence in north Belfast on Monday night and yesterday morning, involving scores of youths, some as young as five.
Police, who generally kept themselves in their Land Rovers, came under sustained petrol and paint bomb attack. The PSNI deployed a water cannon against the troublemakers. Eight people were arrested for riotous behaviour and police said other arrests would follow.
