A Mexican soldier keeps watch on April 29 in Tijuana, three days after a shootout in the border city involving the Arellano Felix drug cartel, which left 13 gunmen dead and littered the street with 1,500 spent casings. (Mark Boster/Los Angeles Times)
A Mexican special forces soldier keeps his identity hidden in Ciudad Juarez. In the year and a half since President Felipe Calderon launched a crackdown against drug gangs, about 4,100 people have died, the government says. At least 1,400 have been killed so far this year, including about 400 in Ciudad Juarez and 170 in Tijuana. (Alfredo Estrella /AFP/Getty Images)
Mexican police stand in formation at Tijuana City Hall on April 29 during a ceremony marking the bolstering of forces in the border city. The ceremony took place three days after the Arellano Felix shootout. (Mark Boster/Los Angeles Times)
Mexican troops patrol the streets of Tijuana in late April. (Mark Boster/Los Angeles Times)
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Tijuana police carry the casket of an officer killed by gunmen in January. (Irfan Khan/Los Angeles Times)
Shoppers pass a bullet-shattered window in Tijuana on April 26. (Luis Sinco/Los Angeles Times)
