NEW : Authorities detail violence , turf battles between cartels . Suspect hurled a grenade and fired at troops as they closed in , a military official says . Comment: Announcement of his capture comes a week after 49 bodies were found along a highway .
NEW : Authorities detail violence , turf battles between cartels . Suspect hurled a grenade and fired at troops as they closed in , a military official says . Known as `` El Loco , '' authorities say Elizondo is a Zetas cartel leader in Nuevo Leon state . Announcement of his capture comes a week after 49 bodies were found along a highway .