BUFFALO, N.Y. (AP) — Police in upstate New York are investigating a case of vandalism at a post office.

WGRZ-TV in Buffalo reports (http://on.wgrz.com/2uQw267 ) 10 cars in the employee parking lot of the Buffalo Processing and Distribution Center were damaged. The crime was reported around 12:30 a.m. Monday.

It's still unclear how vandals accessed the lot.

No arrests have been made.

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Information from: WGRZ-TV, http://www.wgrz.com