 On August 6, 1974, a tank car containing PR-M blew up in Wenatchee, Washington, rail yard, killing two and injuring 66 others.On July 4, 1976, a PR-M storage with 60,000 pounds (approximately 27,200Kg) of PR-M detonated at DuPont's Potomac River Works at Martinsburg, WV.Though there was no loss of life, there were many injuries and a substantial loss of property.