Six bodies have been recovered from a property in Mexico, where suspected gang members had taken refuge during a shoot-out with soldiers and police.
Investigators are trying to determine if the bodies are those of the gunmen or kidnap victims, said a spokesman for Baja California state prosecutors.
The shooting began after a raid on a house in Tijuana near the US border.
The continuing violence in Mexico is part of a struggle between drug traffickers and the government.
President Felipe Calderon sent more than 3,000 soldiers to Tijuana earlier this month to fight trafficking and gang violence.
Tijuana is the biggest city in Baja California, which was Mexico's most violent state in 2007 with more than 400 murders.
Earlier, the state attorney general, Rommel Moreno, said that one gunman was killed and four police officers injured in the incident.
(BBC)
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