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NEW: Police chief says the birthday party shooting was retaliation

Authorities say witnesses are not cooperating with police

CNN —  

A shooting at a child’s birthday party that left one person dead and 11 wounded was a retaliation, Detroit Police Chief James Craig told WXYZ on Sunday.

Attackers fired semiautomatic weapons Saturday night at the party attended by about 300 people, police said. Earlier reports said nine people were wounded.

Police think the shooting was retaliation, Craig said to WXYZ. He noted the 20-year-old man who died had been shot about a month ago.

Four of the injured people are still hospitalized, Craig told WXYZ. No children were shot

People in the neighborhood are not helping officers find the shooters, Craig said.

“You will allow this to continue if you do nothing,” he said of the neighborhood. “We can’t do it alone. This is not the time to be fearful. These are urban terrorists who do nothing positive for our neighborhoods.”

Dolunt said police are looking for the owner of an abandoned red car found across the street whose occupants they believe were shot.

CNN’s George Montgomery contributed to this report.