Mexican authorities are searching for a pair of brothers as suspects in the reported border-lake shooting of American David Hartley.
Hartley hasn't been found since the Sept. 30 attack on Falcon Lake on the Rio Grande.
Tamaulipas State Police unit chief Juan Carlos Ballesteros (bah-yehs-STEH'-rohs) says investigators believe brothers Juan Pedro and Jose Manuel Zaldivar Farias may have killed Hartley as he snapped photos of a sunken church from a personal watercraft.
The officer says the pair are already sought for allegedly belonging to a gang of pirates operating on Falcon Lake, which straddles the U.S.-Mexico border. Ballesteros also says they allegedly terrorized a Mexican town at the south end of the lake.
Ballesteros gave no details of the investigation.