Story highlights 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.

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