COLOMA TOWNSHIP, Mich. (CBS Local) — Authorities in southwestern Michigan are urging residents to be vigilant after razor blades were found inside gas pump handles.

Two razor blades — one rusty and one newer looking — fell from a pump handle Monday night while a customer was filling up at the Speedway gas station in Coloma Township, police said.

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No one was hurt, but six more blades were found Tuesday atop the pump, CBS affiliate WSBT reported.

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“They may have been there trying to do more, but then maybe someone may have saw them and they ran off. I’m not sure what happened,” Chief Wes Smigielski said.

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Police reviewed surveillance video, but were not able to determine when they were placed. There is no suspect information.