“By the time we got there he had left he scene but he must have cut himself because we could follow the trail of blood to a nearby apartment,” said Torbjörn Lindkvist of the county police to newspaper Corren.
The incident occurred shortly after 11.30pm on Wednesday night. The overwrought couple managed to drive away, leaving their attacker behind, and alerted the police.
“They had hardly got into the car before this man turned up. He thrust the sword straight through the windscreen of the car, so hard that it shattered,” Lindkvist said to the paper.
When police arrived at the man's flat he was nowhere to be seen but officers soon caught up with him at a nearby hospital, where he was receiving medical treatments for his cuts.
Police believe that he was under the influence of drugs when he staged the dramatic attack, but are not ruling out underlying mental problems.
“The investigation will tell us,” said Lindkvist to Corren.
The man was apprehended by police shortly after 2.30am and he is currently under suspicion of aggravated assault.
He was formally arrested in the early hours of Thursday morning.