BELLEVUE, Wash.—Investigators have determined that a fire that damaged the Bellevue, Wash., home of Seattle Mariners pitcher Felix Hernandez started in the laundry room.

Lt. Richard Burke says the cause of the Monday afternoon fire remains under investigation. Damage is estimated at $250,000.

Hernandez and his wife, Sandra, were in Napa, Calif., at the time. His agent, Wil Polidor, says their two children were at a mall with their nanny and the pitcher's mother-in-law.

Burke says police have secured the home, which is uninhabitable.

King County public records show the 5,100-square-foot, five-bedroom, four-bath house was built in 2009 and is valued at $2.85 million.