A Pennsylvania mall was evacuated Sunday after a bomb threat was written on a note found in a fitting room, according to police.

The note said there were multiple bombs at the Mall at Robinson in Robinson Township, Pa., just 12 miles outside downtown Pittsburgh. After combing through stores with bomb sniffing dogs, no explosives were found.

The typed note, found at Sears, said the bombs would go off if not found, police told NBC's Pittsburgh affiliate WPXI. No specific time, store or reason was given.

The scene was officially cleared by police around 5:30 p.m. and the mall will reopen on Monday.

No arrests have been made, but investigators hope the note will provide clues as to who made the threat. Police have received an anonymous tip about a possible suspect, WPXI reports.