SCRANTON, Pa. (AP) – A Pennsylvania elementary school closed for the day after educators realized that overnight a man had entered the building, got naked and spilled Murphy’s Oil Soap on the gym floor.

Neil Armstrong Elementary School staff originally thought the spilled soap was a prank, but the principal reviewed security tape footage and saw that a man had been on the premises.

READ MORE: Charges Held For Court Against Fayette County Father Accused Of Severe Child Neglect

Scranton Police Chief Carl Graziano says that once inside the school, the man took off his clothes and walked through at least a portion of the school while naked.

School officials decided at about 7 a.m. to close the school for safety.

READ MORE: Around The Table: Pennsylvania Governor And Senate Races

Graziano says there were no signs of forced entry.

More than 600 students are enrolled at the school, which is expected to reopen Friday.

MORE NEWS: Pittsburgh City Council Hikes Pay By $16,000; City Controller Raises Concerns About Transparency

(Copyright 2019 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)