"No More Weapons!"

That is the message to the United States from none other than Mexico's president, Felipe Calderon.

It's emblazoned on a  billboard made with crushed firearms and placed near the U.S. border. Calderon is pleading with the United States to stop the flow of weapons into Mexico.

The billboard, which is in English and weighs 3 tons, was placed near an international bridge in Ciudad Juarez and can be seen from the United States.

Calderon said the billboard's letters were made with weapons seized by local, state and federal authorities.

"Dear friends of the United States, Mexico needs your help to stop this terrible violence that we're suffering," Calderon said in English during the unveiling ceremony.

"The best way to do this is to stop the flow of automatic weapons into Mexico," he added.

Before unveiling the billboard, Calderon supervised the destruction of more than 7,500 automatic rifles and handguns at a military base in Ciudad Juarez.

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Calderon said more than 140,000 weapons have been seized since December 2006, when he launched a crackdown against drug traffickers. More than 47,500 people have been killed since then.

One of the cities most affected by the violence is Ciudad Juarez, where more than 9,000 have died in drug violence since 2008.

Also Thursday, the country's Attorney General said a federal prosecutor assigned to a northern state has been detained on suspicion of protecting the brutal Zetas drug cartel.

Attorney General Marisela Morales said federal prosecutor Claudia Gonzalez has been sent to prison. She didn't say when Gonzalez was detained or give any other details.

Gonzalez was based in the city of Saltillo, capital of the border state of Coahuila.

The state on the border with Texas has seen a spike of violence as the Zetas and the Sinaloa drug cartel fight for control of drug smuggling routes into the United States.

Based on reporting by The Associated Press.

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