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A MAN claiming to be from the Scottish National Liberation Army has made a sinister firebomb threat to the Better Together campaign.

The man entered their HQ in Cumbernauld and told staff they would be bombed out if they did not vacate the offices within 24 hours.

Two regional organisers were badly shocked and police are investigating.

A campaign source said last night they were taking the incident seriously as it was very different from the usual flak campaigners on both sides of the indy debate get from opponents.

A Better Together insider said: “There have been a few drunks and loudmouths in the past who have barged into our offices to spout their views but this was completely different.

“The man delivered his message in such a matter-of-fact way, the staff felt he was extremely serious.

“There was no shouting or swearing. He remained very calm and simply walked out the door after issuing his ultimatum. It only lasted a few seconds.”

Better Together moved into the new HQ in the Lanarkshire town on Monday. The incident took place on Wednesday.

Their spokesman said: “We only hope this person is found quickly and dealt with by the authorities. It is completely unacceptable.”

Police have have been scrutinising CCTV images from the area.

The SNLA were formed by ex-soldier Adam Busby after the failed devolution referendum of 1979.

Targets of their letter bomb campaigns include First Minister Alex Salmond and the late Tory PM Margaret Thatcher.

Local Labour MP Gregg McClymont said: “This is clearly a serious matter and I am glad the police are dealing with it.

“My primary concern is for the young people who were in the office. There is no place for this kind of behaviour.”