A shooting on a busy tram in the Dutch city of Utrecht on Monday led to three people dead and five seriously wounded. Now, the Utrecht police have arrested the alleged gunman.

The motive of the gunman is unclear at this point.

The incident, which happened around 10:45AM local time, caused schools to be closed and increased police presence at airports and mosques.

The gunman, according to eyewitnesses, “started shooting wildly” as passengers aboard the tram scattered to safety.

“I looked behind me and saw someone lying there behind the tram,” said an eyewitness in an interview with Dutch public broadcaster NOS. “People got out of their cars… and they started to lift her up.

“I helped to pull her out and then I saw a gunman run towards us, with his gun raised,” he said. “I heard people yell ‘Shooter! Shooter!’ and I started to run.”

The gunman then fled the scene, causing a manhunt that lasted nearly all of Monday as police tried to locate him.

The incident caused Utrecht’s threat level to raise to the highest it has ever been, but has since been lowered now that the suspect has been arrested.