Officials said two nitrogen-filled tanks over pressurized and ruptured at the testing site in McGregor around 10:30 p.m. Tuesday.
No one was reported injured and the escape of gas did not result in an environmental hazard.
People from all across the area reported hearing a loud noise and feeling vibrations….
Everyone has been accounted for and everything had returned to normal operations, McGregor Fire Chief Moe Spradley said.
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