Israel Matzav

After fleeing in a stolen car, the gunman went on to target a girl's bat mitzvah party at Copenhagen's main synagogue at one o'clock on Sunday morning, shooting dead Dan Uzan, 37, an economist at the Danish treasury, who was acting as a volunteer security guard. 

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As with the Charlie Hebdo attackers, the head of the Danish security and intelligence service, Jens Madsen, said on Sunday that the gunman had been identified as a potential threat.

"He was on the radar but he was not known to have travelled to conflict areas like Iraq or Syria," Mr Madsen said. "We cannot yet say anything concrete about the motive ... but we are considering that he might have been inspired by the events in Paris," he told a news conference.

Police traced the killer from CCTV footage from the arts café attack, which showed him abandoning his getaway car, a stolen Volkswagen Polo, and taking a taxi. They questioned the driver, and went to the address in the mainly immigrant area of Norrebro where he had dropped off the suspect. 

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In an indication that the gunman may have had accomplices, four people were arrested when a dozen armed police raided an internet café in central Copenhagen. Among the four were a Pakistani and an Arab, according to Danish media reports.