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Alameda fire Capt. Karl Mims, center, and fire investigator Dave Spring investigate an explosion and fire on a sailboat at Grand Marina in Alameda on Feb. 7, 2013. A man was airlifted by Calstar to the Regional Burn Center at Santa Clara Valley Medical Center with unknown injuries.

ALAMEDA -- A boater was airlifted to a burn center Thursday afternoon after an explosion and fire inside his sailboat, authorities said.

No one else was injured.

The man's name, age and the extent of his injuries were not immediately available, said Alameda Fire Division Chief Doug Long, the incident commander on the call.

Firefighters were called to a 30-foot sailboat in the water in the 2000 block of Grand Street shortly before 1 p.m., Long said.

The fire may have been caused by an explosion of a small propane tank for a stove, police said, but Long said fire investigators are still probing the cause.

Long said the man jumped in the water to put out the fire on his clothes. Nearby boaters and people on the dock assisted in putting out the fire.

Long said the man was flown by helicopter to the burn center at the Santa Clara Valley Medical Center.

Reach Kristin J. Bender at kbender@bayareanewsgroup.com. Follow her at Twitter.com/kjbender.