Police are on patrol Friday at MacArthur High School in Levittown.The police presence is due to a threat that was found on a bathroom wall Thursday. Officials say the message threatened an attack on "2/15" at 2:15 p.m. Police say they believe the threat is a prank, but are treating it very seriously. Numerous marked and unmarked police cars were at the school Friday as students and staff arrived for the school day.Some students told News 12 Long Island that they felt safe and secure due to the increase in security. One student, however, said he was upset about the measures.