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As the Austin bomber sensed that authorities were closing in on him on Tuesday night, he took out his cell phone and recorded a 25-minute video confessing to building the explosive devices — but didn’t explain why he targeted his victims, interim Austin police Chief Brian Manley said.

“It is the outcry of a very challenged young man talking about challenges in his life that led him to this point,” the interim chief said. “I know everybody is interested in a motive and understanding why. And we’re never going to be able to put a (rationale) behind these acts,” Manley told reporters Wednesday night.

The video made by Mark Anthony Conditt, whose string of package bombs killed two people and wounded five in Texas, was found on his cell phone when police recovered his body this morning. The cell phone was in Conditt’s possession at the time of his death, police said.

Manley says that Conditt did not mention any references to terror groups or bring up hate.

Conditt killed himself after police tried to stop him early Wednesday in what investigators described as an explosion inside his car.

Federal agents went to the bomber’s home Wednesday while police interviewed his roommates, attempting to determine whether any bombs remained and if Conditt acted alone.

What we know about 24-year-old Mark Conditt

Latest developments

• Authorities think they have accounted for every bomb Conditt made, Manley said.

• Conditt, 23, lived in Pflugerville, a city just outside Austin, according to public records and a longtime neighbor of his parents.

• Officers detained and questioned Conditt’s two roommates Wednesday. Neither person was under arrest, Austin police said.

• An arrest warrant for Conditt and a criminal complaint charging him with one count of unlawful possession and transfer of a destructive device were filed Tuesday night, authorities said. An affidavit detailing the reasons for the warrant and charge is under seal, they said.

• An aunt of Conditt’s said her family is “devastated and broken at the news that our family could be involved in such an awful way.”

• Austin police on Wednesday morning conducted a “follow-up investigation” at the FedEx facility where an intact bomb was found a day earlier, the agency tweeted. The building was temporarily evacuated, but police said normal business “will resume.”

• Conditt was an Austin Community College student from 2010 to 2012 but did not graduate, the school said.