Gun battles between rival factions of a Mexican drugs cartel have left at least 15 people dead in the city of Tijuana, near the border with the US.
Police said all the dead were from the Arellano Felix cartel, which has come under pressure from a rival gang.
Two were wearing police uniforms or equipment, but are thought to have been gang members, police say.
Drug-related violence is a serious issue across Mexico. Nearly 200 people have been killed in Tijuana this year.
Investigators believe two of the dead were senior hitmen for the Arellano Felix cartel and were identified by large gold rings on their fingers.
The rings carried the icon of Saint Death, a grim reaper figure that gangsters believe protects them, police said.
Since taking office in late 2006, President Felipe Calderon has sent nearly 30,000 soldiers and federal police to fi
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