MOSCOW, Idaho (AP)
Hospital officials say four people injured in an explosion at the University of Idaho were in good condition on Friday morning.
Eric Hollenbeck, marketing coordinator from Gritman Medical Center, did not release any additional details about their conditions or injuries. Their names have not been released.
Vice President Daniel Ewart says all four had to undergo surgery after a device they were using to test fuel for an experimental rocket exploded late Thursday night.
Moscow Police Chief James Fry says federal agents are investigating the incident, but it is not a criminal investigation.
Ewart says the people involved were not intending to launch the rocket. Instead they were using a device made up of a galvanized pipe, which measured about a foot in length and an inch and a half in diameter.
Ewart says he does not know how many people were in the vicinity of the explosion, which happened just before 10 p.m. outside the school's steam plant.