Arrested four police officers

Federal agents arrested four police officers just south of the border with Texas on Saturday and were investigating where they got their guns, Mexican police said.
In a joint operation, federal police and soldiers arrested the officers early Saturday morning in the city of Nuevo Laredo across the border from Laredo, Texas, said a spokesman for Mexico's Public Safety Department who requested anonymity because he was not authorized to speak on the matter.
"The army has stepped in to investigate the origin of their weapons," he said.
Mexican radio station Formato 21 said the officers had guns that weren't registered with their unit in the border state of Tamaulipas.
It wasn't immediately clear if the four officers were being investigated for corruption, which is widespread in Mexico, particularly in states like Tamaulipas plagued by organized crime.