The US actor was spotted by police cruising through central Stockholm in a golf cart early on Sunday morning.

Detective Inspector Christer Holmlund, from Stockholm police, said that when police arrested him in the slow-moving vehicle, "he then refused to blow in the breathalyser instrument, citing American legislation," he said.

"So we applied the old method - a blood test. It will take 14 days before the results are in."

Murray had been in the Scandanavian country watching a golf tournament.

After allowing police to carry out the blood test, the star of blockbusters such as Groundhog Day and Lost In Translation later agreed to sign a document admitting that he was driving under the influence and for a police officer to plead guilty on his behalf if the case goes to court.

"Then he was let go," Det Insp Holmlund said.

"My guess is he went back to America."

He added that the actor would only be charged if tests showed his blood alcohol level exceeded the legal limit, which is low in Sweden.