OKLAHOMA CITY . . . HOME-GROWN TERROR

With two men now in custody, investigators of the bombing are pursuing leads that the incident has roots in the American paramilitary fringe. Just 90 minutes after the bombing Wednesday, the FBI disclosed today, authorities arrested Timothy McVeigh -- the "crew cut" man in police sketches -- 60 miles north of Oklahoma City for speeding, and then held him for reasons not yet disclosed. This afternoon, the other man in the sketches, Terry Lynn Nichols, voluntarily surrendered in Herington, Kan.; police officials say he is cooperating in the investigation. The FBI searched the home of Nichols' brother, James Douglas Nichols, in rural Decker, Mich. The Nichols brothers and McVeigh are thought to be members of theMilitia of Michigan, a paramilitary groupthat held meetings in Junction City, Kan., the town where the truck used in the bombing was rented. The group, founded last year, believes the federal government has outstripped its authority, especially in gun control law enforcement. Today, as federal officials began to see the bombing as aplot hatched by Americans, three Middle Eastern men held in Dallas and a Palestinian man returned to the United States from London, were released. At the Alfred P. Murrah federal building in Oklahoma City, the death toll rose to 61 as rescue workers dug more bodies from the rubble. More than 400 people were injured and 154 remain unaccounted for.