CHICAGO (CBS) — Within hours of a deadly attack in Berlin, Chicago police descended upon the German Christmas market at Daley Plaza.

Large police trucks were parked at the corners of the market and several officers on bicycles were patrolling the area.

christmas market Police Presence Outside Daley Plaza Christmas Market After Berlin Attack

At least nine people were killed and dozens injured when a truck plowed through a crowd at a popular Christmas market in Berlin late Monday, police said.

Polizei Berlin said that a suspect had been arrested near the scene, CBS News reports. A passenger in the truck died at the scene, although it’s not clear how or when that happened yet.

The identity of the passenger and arrested suspect have not been released. Police spokesman Winfried Wenzel told ZDF television that the suspect arrested was believed to be the truck driver.

The attack happened in Breitscheidplatz, a major square in the center of the German capital, that is normally filled this time of year with people celebrating the holiday season.

While no official motive has been given in the attack, CBS News correspondent Charlie D’Agata reports witnesses saying that there was no doubt it was a deliberate attack based on the way it jumped the curb.

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