Texas police have recovered what they say is a "confession" made by suspected Austin bomber Mark Conditt.
The 25-minute recording was found on a cell phone during a search of Conditt's house. Police say it describes six bombs that killed two and injured four others.
However, the recording contained no clue as to motive.
Outcry of a challenged young man
Austin Interim Police Chief Brian Manley said in a statement:
"He does not at all mention anything about terrorism, nor does he mention anything about hate. Instead it is the outcry of a very challenged young man talking about challenges in his personal life."
Manley said the recording appeared to confirm that all of Conditt's explosive devices have been accounted for.
Security video clues
Investigators were led to him in part through security video from an Austin-area FedEx store.
On Tuesday, authorities filed an arrest warrant charging 23-year-old Conditt in connection with the bombings.
Conditt blew himself up with a seventh bomb after as police closed in on his car on Wednesday morning.
Law enforcement agents later removed a cache of explosives and bomb-making materials from his Pflugerville house. They said the finds were consistent with devices to the three-week bombing spree.