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. Last Updated: 07/27/2016

Alleged Sightings Nail McVeigh

OKLAHOMA CITY -- One witness spotted Timothy McVeigh driving a Ryder truck toward the U.S. government building. Another saw him minutes later, speeding away in a car just before a blast ripped through the building.

Alleged sightings by these and other witnesses are part of the mounting evidence against the only person charged so far with the April 19 bombing, the deadliest terrorist act in U.S. history.

At a hearing Thursday, U.S. Magistrate Ronald Howland found sufficient evidence to hold McVeigh without bail pending a trial. McVeigh, 27, is charged under a federal anti-terrorism statute that carries the death penalty.

"I could not imagine a more heinous offense than this," federal prosecutor Merrick Garland told Howland.

Authorities are seeking a second suspect -- so far not identified -- who they fear may bomb again.