AUSTIN, Texas — Federal officials said Monday that the suspect in a series of fatal Austin package bombings used PVC pipe casing, a metal pipe and shrapnel in his attacks that killed two people and seriously injured four others.
Authorities released an affidavit used to support an arrest warrant for suspect Mark Conditt. Investigators used bomb evidence, video surveillance, interviews and phone records to chart a path to Conditt. Police say he blew himself up March 21 as officers closed in to make an arrest.
The document still redacts details about some of the explosive materials used, confidential witnesses who were interviewed and phone numbers.
John Bash, U.S. attorney for the Western District of Texas, said authorities also dismissed an arrest warrant that had been issued hours before police say Conditt killed himself.
Bash said the investigation continues although no other suspects have been arrested “and we no reason to believe there are other suspects.” Authorities have yet to determine a motive for Conditt’s attacks and the affidavit gave no hint of one.
“We are looking through very voluminous computer records to examine his intent, his motivations,” Bash said.
Beginning March 2, police say Conditt, 23, planted bombs in different parts of Austin. He began by placing explosives in packages left overnight on doorsteps, killing 39-year-old father Anthony Stephan House and 17-year-old musician Draylen Mason and critically injuring 75-year-old Esperanza Herrera. He then rigged an explosive to a tripwire along a public trail, injuring two young men who crossed it. Finally, he sent two parcels with bombs via FedEx, one of which exploded and injured a worker at a distribution centre near San Antonio.