(CNN) A van slammed into a crowd Saturday in an apparently deliberate act in the German city of Muenster, killing two people and leaving 20 others injured, officials said.

The driver also shot and killed himself, a police spokeswoman said. The driver was a German citizen, said Herbert Reul, state minister for internal affairs in North Rhine-Westphalia state.

Authorities are treating the incident as an attack. There is no known connection to radical Islam but investigators are still looking into the driver's background, Reul said.

Police earlier said there were three deaths. Reul clarified later Saturday that the total included the attacker.

Muenster police spokesman Andreas Bode said law enforcement is looking into witness reports that some people fled the attacker's van after the attack. He also said there was a suspicious object in the vehicle that was under investigation.

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