Tiffany Hartley of Milliken, Colo., says her husband, David, was shot by Mexican pirates on Falcon Lake last week as they were returning to the United States on Jet Skis.
The Mexican government tells The Associated Press that it has opened a federal investigation into the reported shooting of an American tourist on a U.S.-Mexico border lake.
A statement from Mexico's Ministry of Foreign Affairs provided to the AP also "categorically rejects claims to the effect that Mexican authorities are not doing enough to find" Dennis Hartley. Hartley's wife, Tiffany, says her husband was shot and killed by Mexican pirates on Falcon Lake on Sept. 30 as they were returning on Jet Skis from a sightseeing trip into Mexico.
Texas Gov. Rick Perry and the Hartley family have said this week that Mexico was dragging its feet in investigating Hartley's disappearance and looking for his body. Perry had previously asked Mexican President Felipe Calderon to call him regarding the reported shooting.
Ruben Rios, a spokesman for the Tamaulipas, Mexico, state prosecutor's office, says the search of Falcon Lake resumed early Friday. He says the search is called off at night because of weather and waves, but U.S. officials have also said threats from drug gangs have hampered the effort.
Rally planned at Denver's Mexican consulate
Friends and supporters of Hartley plan to gather for a rally in Denver. They will assemble outside the Mexican consulate at 1 p.m. Friday to bring attention to the Hartley case.
Hartley's wife and family, who are from Colorado, have been calling on Mexican authorities to do more to investigate and find his body in a lake on the Texas-Mexico border.
The search has now intensified with people on speedboats, helicopters and all-terrain vehicles searching for Hartley. U.S. officials said threats of an ambush from drug gangs temporarily thwarted efforts.
Border security debated in Texas governor's race
The search for Hartley has prompted both Texas gubernatorial candidates to criticize each other over border security.
Republican Gov. Rick Perry this week revived criticism that Democratic opponent Bill White ran a "sanctuary city" for illegal immigrants while Houston mayor.
Perry cited a policy that prevents Houston police from asking anyone they stop about whether they are in the United States legally. Officers now can ask suspects only whether they are U.S. citizens. Perry said he planned to make elimination of such limitations an emergency item for the Legislature when it meets in January.
On Friday, White said in Houston that Perry was playing politics with law enforcement and that Perry's proposal would divert police from responding to emergencies and investigating crimes.