Police are investigating after several homemade acid bombs were planted on the Valencia College campus in Orlando, Fla., cfnews13.com reports.

A total of seven bottles were found in parking lots along walkways near buildings, the station reports. Two of the bottles exploded Friday night, about 100 yards apart.

The bombs are made using soda bottles and household chemicals, according to cfnews13.com.

Earlier, three acid bombs were found in an alley behind a student building and a parking lot as students were returning from winter break. Two of those bombs exploded.

No one has been hurt in the incidents.

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