(Updates with official identification of dead suspect)
By Jon Herskovitz
PFLUGERVILLE, Texas, March 21 (Reuters) - Police tracked the 23-year-old man suspected of carrying out a deadly three-week bombing campaign in Texas for a day before closing in on him on the side of a highway where he blew himself up early Wednesday, law enforcement and local media said.
Federal prosecutors on Wednesday revealed that before his death they had charged Mark Conditt, 23, of Pflugerville, Texas, with unlawful possession and transfer of a destructive device.
A series of bombings beginning on March 2 killed two people, injured at least five and left Austin, a fast-growing city of 1 million people, on edge as the bomber moved from parcels left on doorsteps to one activated by a trip wire to at least two sent via FedEx.
Police tracked Conditt to a hotel about 20 miles (32 km) north of Austin and were following his vehicle when he pulled to the side of the road and detonated a device, killing himself, Austin Police Chief Brian Manley told reporters near the scene.
"The suspect is deceased and has significant injuries from a blast that occurred from detonating a bomb inside his vehicle," Manley told reporters. He declined to further identify the suspect, except to say he was white.
Reporting by Jonathan Herskovitz Additional reporting by Brendan O'Brien in Milwaukee and Jonathan Allen and Gina Cherelus in New York Writing by Scott Malone; Editing by Jeffrey Benkoe and Rosalba O'Brien