Mexican authorities on Friday announced the arrest of six police officers as suspects in the slaying this week of the mayor of a wealthy northern city.

The suspects include a police agent who served as the mayor's bodyguard. But as Jose Alberto Rodriguez and the other five suspects were paraded before journalists Friday, Rodriguez proclaimed his innocence. "I did not participate!" he protested.

Separately, the army announced the capture of four suspected gunmen who may be implicated in the slaying, caught in a raid Friday on a house where a small arsenal of grenade launchers and other weapons was seized. A dozen or more gunmen escaped the raid.

Edelmiro Cavazos, the mayor of Santiago, was grabbed from his home Sunday night by at least 15 armed assailants wearing uniforms from a defunct police agency. His bound body was found Wednesday morning dumped alongside a road.

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