BROOKLINE (CBS) — A 20-year-old man who was stabbed multiple times in Brookline’s Amory Park early Tuesday morning has died. Officers spent hours searching the park for evidence.

The victim, Nicolas Kern of Brookline, passed away “following extensive medical treatment” at Beth Israel Hospital, according to the Norfolk District Attorney’s Office.

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“At approximately 1:38 this morning we responded to Amory park for a reported assault by means of a dangerous weapon,” said Brookline Police Lt. Philip Harrington.

People who frequent the park told WBZ-TV they were surprised by the violence.

“I walk here from where I live just a few blocks away and I’ve never had any problems like this,” said Eric Colles.

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Crime scene tape was scattered across the more than eight acres of Amory Park by the time many walkers arrived.

“All the trash cans are open so I thought they were looking through the trash, Colles added. “I never thought it would happen here.”

Joseph Litvak said, “It horrible. It’s horrifying. This neighborhood has always seemed very safe to me…I walk through this park at least once a day, every day, even in the winter when the snow makes it difficult.”

Police said they do not believe there is a threat to the public at this time. While the park is now open, the investigation is ongoing.

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Anyone with information is asked to call police.