Ciudad Juarez car bomb attack
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Aftermath of Ciudad Juarez 'car bomb' in Mexico

Investigators in Mexico say a deadly attack by suspected drug cartel members in the northern city of Ciudad Juarez was a car bomb set off by mobile phone.

Two police officers and two medics answering an emergency were killed.

It is believed to be the first attack of its kind since President Felipe Calderon took office in 2006, promising to curb powerful drugs gangs.