Swedish police have released video footage showing a man leaving an unconscious man to die on the underground train track after mugging him at a station in southern Stockholm.

The security video from a Stockholm train station shows a 38-year-old drunk man falling on to train tracks last week.
A bystander who witnessed the accident jumps down after him, but not for a daring rescue before an approaching train arrives.

Instead, the witness steals the man's valuables, climbs back on the platform and leaves his victim to be hit by the train.

The victim, who was on his way home from a party survived, but was seriously injured. Doctors had to amputate half his left foot, Sweden's TV3 channel reported.

Swedish police now hope that surveillance camera footage of the incident at a Stockholm subway station early on Sunday will help them find and arrest the unscrupulous thief.

Police on Thursday said they have received several tips after the video was shown on Swedish TV this week.

"To me it's incredible that one could steal or rob from somebody who is lying in such a place where you know that, if I don't do something, then this person will, in a worst-case scenario, get killed by the train that is coming," police inspector Dan Ostman told TV4.

The thief had short, dark hair and was wearing a blue jacket and dark pants. He was described as being between 35 and 40 years old and about 175 centimeters.

He calmly walked out of the subway station, waving to the ticket vendor, as a train ran over the victim on the tracks below.