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(MLive.com | File)

DETROIT - Michigan State Police are investigating gunshots heard at what was thought to be an illegal drag-racing event in Detroit this weekend.

A state trooper on patrol in Detroit saw a large crowd gathered at McGraw and Grand River at 4:15 a.m. Saturday on the city's west side "and observed vehicles believed to be involved in drag racing activities," according to police.

Upon arrival, the trooper heard gunshots coming from the area where the crowd was standing, a police report says.

Detectives later collected shell casings from the scene and the intersection was closed for about six hours as evidence was gathered.

The investigation is ongoing. The MSP is asking for anonymous tips at 855-MICH-TIP or Crime Stoppers at 1-800-SPEAK-UP.