LANCASTER, N.H. (AP) — Safety officials in New Hampshire worked through the night investigating the collapse of a circus tent during a severe storm that killed two spectators and injured at least 22 other people.

Authorities were looking at how the tent was put up at the Lancaster Fairgrounds, about 90 miles north of the capital of Concord. They also were talking to survivors and witnesses.

Fire Marshal William Degnan said it was the first time his agency had investigated a tent collapse.

The storm, packing 60 mile-an-hour gusts and hail, blew through around 5:30 p.m. Monday.

Degnan said about 100 people were inside the tent at the time, and a man and a girl died.

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