One person critically ill after rocket experiment explosion
One person is in a critical condition and three others are stable following an explosion in a car park where people had gathered to test an experimental rocket at the University of Idaho.
Vice president for infrastructure Daniel Ewart said the explosion happened just before 10pm on Thursday night outside the university's steam plant.
Northwest Organisation of Rocket Engineers member and student Grant Thurman said the club tried testing rocket fuel, but when one of the club's co-presidents ignited the fuel, it exploded.
Mr Thurman said the man wore facial protection, but the other co-president standing nearby wore only eye protection.
He said other club members also wore eye protection.
The names of those injured in the blast have not been released.
Authorities are investigating the explosion.