The authorities in Southern California said on Monday that they had searched the Santa Barbara offices of the business that operated the scuba diving vessel in which a fire erupted last week, leaving 34 people dead. The development could lead to criminal charges in the disaster.

Investigators searched the offices of Truth Aquatics as well as two other vessels operated by the company on Sunday and Monday, according to the F.B.I., one week after the boat, the Conception, burned and sank near the Channel Islands.

The United States Coast Guard, the Bureau of Alcohol, Tobacco, Firearms and Explosives and the Santa Barbara County Sheriff’s Office all participated in the searches.

It was not immediately clear what the authorities were looking for and what they found. No criminal charges had been filed, the authorities said.