ANTIOCH, Calif. — A capsized riverboat sitting in California’s Sacramento-San Joaquin River Delta is spurring worries about pollution.

State and federal officials say the 87-foot Spirit of Sacramento may be leaking diesel fuel. The vessel took on water and capsized early Sunday near Bethel Island in Contra Costa County.

No one was injured. Two people on board jumped in a dinghy and made it to shore.

The Coast Guard says the boat was once used for tours but was being used for private recreation when it capsized. The cause is not clear, and officials have not located the boat’s owner.

The Coast Guard says the vessel may have had as much as 600 gallons of diesel onboard, and they are working with the California Department of Fish and Wildlife to keep it contained.