Nashua, New Hampshire explosion investigators issue warning about ice on roofs - CBS Boston
Summary
Toxic Exposure Nashua New Hampshire in Nashua, New Hampshire: A massive explosion in Nashua, New Hampshire, caused by falling ice, destroyed a mental health facility, injured three firefighters, and the fire chief warned about ice buildup on roofs. The building was a total loss, and the cause is under investigation.
Original reporting
Nashua, New Hampshire explosion investigators issue warning about ice on roofs - CBS Boston