Seven horses died in a fire at a boarding facility in Chesapeake City, Md., Sunday morning, The Associated Press reported.

Joseph Zurolo, a spokesman for the state fire marshal’s office, said five of the horses belonged to one family.

The fire at Royal Equestrian Center caused damage of around $1 million. The report noted it took 75 firefighters around 45 minutes to get the fire under control. One firefighter sustained minor injuries.

Zurolo said it’s too early to tell what caused the fire, but investigations are ongoing