The last sign of life was from a mobile phone call with his sister.

The teenager had been at a party in Backa in the Hisingen area of the city. He left the party together with a friend to head home by bus but they were separated at the bus stop near Backadal. The man has been missing since.

“This is the last recorded contact that we have with him. We have opened a case into suspected abduction as we can not rule out that something may have happened to him,” said Thomas Fuxborg at Gothenburg police to the TT news agency.

Police continued to search after the man throughout the course of Sunday.

According to local media reports the man rang his sister shortly after becoming separated from his friend at the bus stop.

“It sounded like he was being chased, he rang and was breathless. It was a scary phone call. He also said something about a knife, then the call was interrupted,” the sister told the local Göteborgs-Posten daily.

The police were unwilling to confirm whether they had been able to trace the 19-year-old’s mobile phone.