4 arrested in killings of federal agents

MONTERREY, Mexico — Four suspects were arrested Friday in the kidnapping and killing of two federal agents investigating drug trafficking in Northern Mexico, authorities said.

The arrests came just hours after the bodies of Rene Lorenzo Lopez and Roberto Krhisna Raul Martinez, both agents of the Federal Agency of Investigation, Mexico's equivalent of the FBI, were found in a river in the city of Santa Catarina, in the northern state of Nuevo Leon, the federal Public Safety Department said in a news release.

The agents were naked, their limbs and heads bound with what appeared to be duct tape, state and federal police said.

Their names and cause of death weren't immediately released.

If linked to organized crime, the slayings bring to 29 the number of law enforcers believed killed by drug gangs this year in the Monterrey area, according to a media tally.