Milanowski said devices using tripwires are activated when any pressure is applied to the wires, and he said that can include people "tripping over it or picking up the package". Authorities did not release the names of the victims.
Investigators have found similarities between that device and three previous bombs, which were stuffed inside packages and left on residents' doorsteps, Austin Police Chief Brian Manley said.
Along with more than 500 federal agents, bomb technicians from San Antonio and Houston are headed to Austin to help with the case.
Officials have upped the reward to $115,000 for information that leads to an arrest for the prior package explosions.
Police warned residents in the immediate area to stay inside their homes until at least 10 a.m. Monday.
Initial reports indicate some key differences between the latest bombing and the other three, including that it happened at night, did not occur in east Austin, did not appear to be on someone's front porch, may have been set off by a trip wire and may not be a package.
Fred Kolanowski, the agent in charge of the Alcohol, Tobacco, Firearms and Explosives office in Austin, said the terrifying aspect of using a tripwire is that it could have been triggered by anyone, including children in the residential area.
A tripwire can be made of materials including filament wire, metal or fishing line. Join us in a conversation about world events, the newsgathering process or whatever aspect of the news universe you find interesting or important. "Again, airplanes go by and cars backfire so we didn't think much of it", says Malachowski. The two victims in Sunday's blast were two white males, Manley toldABC News on Monday.
Instead, this bomb was left on the side of the road in the upscale Travis Country neighborhood of southwest Austin. At that point, authorities said they weren't ruling out racial bias as a factor but they weren't claiming that was the motive either.
"It appears that no one is safe, and I'm very fearful for our community", said Richard Herrington, 75, who was watching the NCAA men's basketball tournament when he heard the explosion.
Police blocked entrances to the neighbourhood where the explosion occurred and put up yellow tape about half a mile from the home where it happened. They enjoy the risk of it - not just the danger of building a bomb, but also of transporting it to neighborhoods where people live and they could easily be caught.
Police in Austin, Texas, may have a serial bomber on their hands. Manley said Monday that police still do not have evidence leading them to a particular suspect, and he reiterated his plea to the public for tips and information.
"If this explosion last night was the result of a bomb that was utilizing tripwire technology, that is showing a different level of skill above what we were already concerned that the suspect or suspects may possess", he said on "GMA".
Who are the victims in the Austin bombings?
This latest attack has even impacted area schoolchildren. "It's just that we provide additional resources".
He also said the latest explosion marked an apparent shift in tactics after the three previous devices were left at people's homes.
Law enforcement members from all over have taken notice, Manley added.
"We don't understand why they are doing this", said Combs.
Package bombings killed Stephen House and Draylen Mason.
Police have identified the six people who died when a pedestrian bridge crumbled Thursday west of downtown Miami , Florida . Two of those heavily trapped cars were removed Saturday morning and two more were removed later in the day, officials said.
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