Published: May 28, 2011 11:21 PM EDT
Updated: May 28, 2011 11:23 PM EDT

ST. PETERSBURG, Fla. (AP) - One person is dead and another missing after an unmanned boat was found near the Sunshine Skyway bridge in St. Petersburg.
 
Authorities said another boater pulled a 6-year-old boy and 44-year-old Phong Quoc Ngo out of the water late Friday. Ngo was pronounced dead after being brought ashore.
 
The boy was taken to the hospital. His name and condition have not yet been released.
 
A third boater, 34-year-old Hoa Van, was also taken the hospital. His condition was immediately released.
 
Several agencies were searching Saturday for a fourth person, 36-year-old Quang Minh Tran. It's also not clear how the boaters ended up in the water.
 
The Florida Fish and Wildlife Conservation Commission is investigating.