Michigan State Police say a caller warned of five 'dirty' bombs located in Genesee County schools, at least one school has gone into lock-down. The Genesee County Sheriff asks that all area residents please not call 911 for information; the calls are blocking the 911 lines. Read on for more information.

According to mlive.com: "ISD spokesman Jerry Johnson said in the e-mail that threatening call was apparently made by an older man. The message warned that officials had two hours to locate the bombs but didn't specify where they would be located."

Keep checking back -- we will update the information as we find out more.