Around 2:45 p.m., flames and smoke were reported just south of the San Bernard River.
Coast Guard helicopter found a 25-foot-long vessel burned beyond identification. The vessel sank shortly after crews arrived.
“Our No. 1 priority is the preservation of human life,” said Lt. Mike Hart, chief duty officer at Sector Houston-Galveston. “We have several assets actively searching for any possible missing persons.”
Coast Guard crews said they would continue searching throughout the night.