LAREDO, Texas, March 8 (Reuters) - Frustrated by tighter security on the U.S.-Mexico border, illegal immigrants and drug traffickers are taking it out on U.S. agents, increasingly attacking them with guns, rocks and petrol bombs. 

Assaults against Border Patrol officers rose 10 percent to 843 incidents in the year to September 2006 from the same period a year before, officials say. It is also a near three-fold increase from two years previously. 

Mexican drug cartels, locked in a turf feud and under pressure from an army crackdown, are lashing out at law enforcement officers in Texas.

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