Meanwhile, Texas Governor Greg Abbott said his office's Criminal Justice Division would offer a reward of up to US$15,000 for information leading to the arrest of the person or people involved in the package bombs. It said Dixon is friends with the grandfather of the second victim, the teenager killed Monday.
The City of Austin is on edge as two incidents happened Monday.
A 75-year-old woman was severely injured in the afternoon attack.
A woman who gave her name only as Ruby said she lives on the street behind Galindo and was home with her mother at the time of the blast.
"We do know that both of the homes that were the recipients of these packages belonged to African Americans, so we can not rule out that hate crime is at the core of this, but we're not saying that that's the cause", Manley said.
Organizers of the South By Southwest festival are urging those visiting Austin, "if you see something, say something", after three package bombings killed two people and injured two others in less than two weeks.
"We are not going to tolerate this in Austin", Manley said while briefing reporters on the explosion.
One package was found on the front porch and taken to the kitchen, where it later exploded.
Police have not said the bombings pose a threat to the festival.
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"The damage is significant, and there's a lot of evidence that needs to be collected", Manley said.
"The world is just filled with insane people, that in their minds, the only crime is how you were born", says Jay Brewer, neighbor.
"This is the third in what we believe to be related incidents over the past 10 days", Police Chief Brian Manley said during a press briefing on Monday. "There's a certain level of skill required to move a device like this".
Investigators originally suggested that the attacks could constitute a hate crime because the victims were all black or Hispanic, but they now say they are looking at all possible explanations.
Authorities urged the public to call police if they receive any unexpected packages. A neighbor, Brandon Rendon, told Reuters the victim was in a wheelchair watering her grass before the blast occurred. The victim, whose name was not released by police, opened it, and the device exploded, killing him and injuring a woman in her 40s. The explosions Monday happened at homes just a few miles apart.
Federal investigators were helping local authorities in the probe.
Key said that while there are many ways to build bombs with easy-to-obtain chemicals and materials, "high explosives", such as dynamite, are harder to come by. Both the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) are on the scene and have joined the local police to investigate. But he said they were an "average-size letter box" and "not particularly large".
In the awake of the explosions, Texas governor's office is offering a reward of up to 15,000 US dollars for any information that leads to the arrest or identification of those involved.
"We will leave no stone unturned because we will not allow this to go on in this city", he said.