Malmö police chief Stefan Sintéus told reporters that the city has a number of active gang fights and that one of them probably instigated Monday night's violence.
He declined to go into details about the what the dispute could be about but said, "Generally speaking these groups can feel upset or disrespected over something. It can be some unexplained affair or over a girlfriend or something else."
The victims, all men between the ages of 18 and 32, were gunned down outside an internet cafe on Drottninggatan shortly before midnight. As of Tuesday morning, no arrests have been made.
Minister for Justice and Home Affairs Morgan Johansson weighed in on the shooting at Tuesday morning press conference, saying that anyone with information should come forward and speak with police.
He also said news of the shooting filled with with anger and frustration as well as motivation to uproot organized crime in Sweden.