PLAINSBORO, N.J. (AP) — Officials say an oxygen tank exploded at a New Jersey hospital and seriously injured a nurse.

The blast occurred a little before 9 .m. Thursday in a room at Princeton Medical Center in Plainsboro. Officials are trying to pinpoint why the tank blew.

READ MORE: WATCH LIVE: Pennsylvania Horticultural Society To Preview Plans For 2021 Philadelphia Flower Show

The hospital says a nurse was taken to a burn unit at St. Barnabas Medical Center in Livingston and is listed in critical condition.

A patient and visitor were both treated for smoke inhalation.

READ MORE: Firefighters Save Bride's Wedding Dress After Fire Breaks Out At Normandy Farm Hotel In Blue Bell

More than a dozen patients in rooms near where the explosion occurred were moved to rooms on other floors.

(© Copyright 2013 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)

MORE NEWS: WATCH LIVE: Philadelphia Officials To Provide COVID-19 Vaccination Program Update