LANCASTER, N.H. — It’s unclear why a circus that was warned about impending severe weather put on its planned show in a tent that ended up collapsing in a storm, killing a spectator and his 8-year-old daughter, the state fire marshal said Tuesday.

More than 30 others were taken to hospitals after the collapse Monday night at the Lancaster Fairgrounds, about 90 miles north of Concord.

Fire Marshal Bill Degnan said it’s the responsibility of the circus operator to monitor the weather. The show began seven minutes after the National Weather Service issued a severe-thunderstorm warning. The storm blew through about 15 minutes after that, with about 100 people inside the tent.

Heidi Medeiros, who attended the circus with her 3-year-old son, told WMUR-TV that the metal poles holding up the tent flew out of the ground, then slammed onto the bleacher where they had been sitting.

Degnan said the storm cut a track of a half-mile to a mile that included downed trees while it approached the tent.

The victims of the collapse were identified as Robert Young, 41, and his daughter Annabelle, of Concord, Vermont.

The yellow- and red-striped tent was still on the ground Tuesday afternoon, away from the bleachers. Items were still strewn about, such as concession-type inflatable Sponge Bob figurines.

Degnan said the operator, Sarasota, Florida-based Walker International Events, has been cooperating in the investigation.

Walker’s president, John Caudill Jr., has a history of violations with the U.S. Department of Agriculture, primarily while operating another company, Walker Brothers Circus Inc.

A decade ago, Caudill and his associates agreed to pay a $25,000 fine for a series of violations in 2001 while operating without an Animal Welfare Act license. The license, which allows businesses to display animals publicly, had been suspended in 1997 for other violations.

The 2001 violations, which resulted in a five-year license suspension, included failing to get adequate veterinary care for elephants with severe chemical burns and a bacterial infection, as well as elephants with overgrown footpads and toenails. They also were cited for failing to get treatment for an elephant that was excessively thin, and failing to have a proper distance or barrier between elephants and the public during a viewing.

Caudill was also cited in 1997 for not providing adequate veterinary care, failing to maintain complete records on animals and not providing structurally sound enclosures in good repair. His license was suspended for 30 days. When Caudill didn’t pay a $5,000 fine, the USDA sued him for an additional $2,700 in fines and penalties.

Degnan said no request was made to state or local officials to inspect the tent. Degnan said he didn’t know if local officials knew or should have known the show was taking place. He said the show would have required a “place of assembly permit,” but one was not sought.

Those questions are part of the state’s investigation, as well as the tent’s setup and a building and fire code assessment, Degnan said.

Leon Rideout, chairman of Lancaster’s selectboard and a state representative, said the town has no ordinance dealing with licensing or permitting of circuses, but state law requires approval from town officials, including the police or fire department. Rideout said the town will discuss whether changes are needed to local law.

“The question is, even if we held an inspection, I’m not sure we would have someone that would be qualified to tell us that the tent wasn’t properly set up,” he said.

For circus-type events, state law requires any event in a tent with more than 50 people in attendance to hold a license from town or city officials. State law also says the licensing agency “shall inspect, or cause to be inspected” each place of assembly to examine aisle space, prevention of overcrowding and the maintenance of exits, among other things.

The law also requires any “public dance, circus or carnival” to apply for police attendance. Lancaster police officials weren’t immediately available to say if the event operator applied for a police detail.

At least some of the injured have been released from hospitals. Mike Barwell, a spokesman for Dartmouth-Hitchcock Medical Center in Lebanon, said a 5-year-old boy was in fair condition there.

The circus canceled shows in Bradford, Vermont, on Tuesday and Wednesday, state police said.

Walker International Events is scheduled to bring the circus to Sanford, Maine, for two performances on Sunday, and organizers there have not been alerted to any cancellations. Four performances are scheduled for Hiram on Monday and Tuesday.