US woman caught 'smuggling ammunition into Mexico'
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The soldiers said they had become suspicious when they noticed the extreme weight of the trolley.
They said she confessed to planning to sell the cartridges in Ciudad Juarez, Mexico's most violent city.
Ms Marrufo Sanchez was crossing into Mexico at the Ciudad Juarez border post on a public bus from El Paso, Texas, when soldiers conducted a routine search.
Under some clothes and tinned food, they found 50 boxes of cartridges for AK-47 rifles and 45 boxes of ammunition for various calibre weapons.
She is being held at a detention center in northern Chihuahua state.
Mexican President Felipe Calderon has repeatedly urged the US government to tighten laws regulating the sale of guns and ammunition in the US to prevent high-powered weapons being smuggled into Mexico.
In June, a US Congressional report suggested some 70% of firearms recovered from Mexican crime scenes in 2009 and 2010 and submitted for tracing came from the US.
From other news sites
CNN Mexico: Alleged ammo smuggler is U.S. citizen 3 hrs ago
Telegraph Mexico drug suspect 'El Diego' could be extradited to United States 60 hrs ago
Channel 4 Mexican drug trafficker wanted for 1,500 murders arrested 01 Aug 2011
The Independent Drug cartel leader who admits 1,500 killings is held 01 Aug 2011
Reuters UK Mexico captures Juarez cartel hitmen leader - report 31 Jul 2011
