His mother is in stable condition.
The bombings could be a hate crime, considering the victims are all black or Hispanic, or they could have been targeted for some other reason, considering two of the three families affected reportedly knew each other through activism in the local black community.
The packages were placed in front of the residents' houses, said Manley, the police chief. The teen's grandfather is Norman Mason, a prominent dentist in east Austin.
Nelson Linder is the longtime president of the NAACP chapter in Austin. A second blast killed a 17-year-old teenager and a third one wounded a 75-year-old woman.
Austin Police Chief Brian Manley said on Monday that there's now no other evidence indicating a hate crime beyond the victims' race.
"We are not ruling anything out at this point", Manley said at a press conference. Both victims were African-American. A UT spokesman told The Austin American-Statesman that he had been accepted at the Butler School of music.
"Austin is quickly becoming a city of the privileged and the non-privileged", Dixon told the newspaper.
Police don't yet know the motive behind the bombings, but so far they've seemed to target people of color. "They feel vulnerable, and they should based on the nature of the incidents". Manley said, "We're not saying that we believe terrorism or hate is in play, but we absolutely have to consider that because we don't want to limit what we are investigating, what we are considering and how we are approaching this case". They devices also had some sort of safety switch, which enabled the bomber to move the devices without blowing themselves up, the sources briefed on the investigation told ABC News.
"I took a walking stick and from behind my door, I cautiously tumbled the box over to bring up the label, where I could verify it was addressed to me and from the expected shipper", Mathis said.
The package explosives involved in the three incidents were not delivered by the U.S. Postal Service or any private carrier, but were left overnight on doorsteps.
Police continue to warn any residents that find a suspicious package to call 911, and to send tips to Austin Crime Stoppers at (512) 472-8477 or Texas Crime Stoppers at 1-800-252-8477. Authorities responded to 250-plus calls about parcels without finding any that were explosives.
Police in Austin, Texas are searching for leads after a series of bombings resulted in at least two deaths and two other serious injuries. A reward of an additional $50,000 was announced Tuesday by Houston ATF, the San Antonio FBI division and Austin Police Department. Authorities have urged people receiving unexpected packages to call 911 without handling, moving or trying to open them.
The first blast on March 2, which killed House, was initially regarded as an isolated incident, police said. The east side has historically been more heavily minority and less wealthy than Austin's west side, although that has changed as gentrification has raised home prices and rents everywhere.
The attacks unfolded as tens of thousands of visitors arrived for the busiest days of South By Southwest.
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