A 13-year-old boy is said to have killed a homeless man at the Dortmund harbor. The police and public prosecutor announced this on Friday. A cell phone video shows how the child stabbed the man with a knife on Thursday evening. After the man’s violent death, the police initially arrested four underage suspects.

The victim is a 31-year-old man who most recently had no known address. In an initial statement on Thursday evening, investigators initially reported a victim who had not yet been identified and four people who had been arrested.

Witnesses saw an argument and called the police. Four people fled, but were temporarily arrested a few minutes later. According to the current status of the investigation, it can now be assumed “that the four arrested people happened to meet the victim at the port,” it said on Friday. The possible murder knife was tracked down by a police dog near the crime scene.

The two children were released from police custody after their hearings, investigators said on Friday. According to the information, the two young people are being represented by a lawyer and should be questioned later in the day. “Then it will be decided whether they will be brought before the judge.” A homicide squad had been set up.

Editor’s note: This article has been updated.