Juan Cifuentes, 33, and Farooq Abdulrazak, 37, were reported missing in July after failing to return home from a business trip to Denmark and Sweden.

The pair's car was found in Malmo, with Swedish media reporting that at least one of the victims was shot before the vehicle was set on fire.

Swedish prosecutors confirmed earlier this month the remains found in the wreckage of the car had been identified as the two Britons.

Investigations continue in the UK as well as in Sweden, according to Swedish prosecutors.

In a statement, they said: "The prosecutor has today arrested a person on probable cause suspected of aiding and abetting the murder of two British citizens who were found dead in a burnt-out car in Malmo on 14 July this year.

"There will now be interrogations, both with the suspect and others."

Magnus Pettersson, head of the preliminary investigation, said prosecutors had until Sunday to decide whether or not the suspect should remain in custody.

'Coming to terms with it is the hardest part'

A friend said the two Britons were "role models" in their communities.

Mr Abdulrazak had gotten married in the past few months, while Mr Cifuentes had a wife and two children, aged eight and three, according to the friend.

The pair were business partners in what the friend described as "their dream job", reported to be travel company Empire Holidays.

"On Tuesday morning I heard on the radio that two Brits were found in a burnt-out car and that police were investigating it," the friend said.

"I didn't think anything of it but then to learn that they were my friends is something else."

"Just coming to terms with how they passed away is, I think, the hardest part," he added.

"Their families are facing the greatest grief you can imagine. Everyone is waiting for the police investigation to complete, to find out what happened."