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\"PHOTO:
Suzanne Cordeiro/AFP/Getty Images
PHOTO: The scene near Galindo Street in Austin, Texas, March 12, 2018, where a woman in her 70's was injured in an explosion.
>

Monday's attack

The first explosion occurred around 6:44 a.m., police said. It was \"very similar\" to the March 2 incident, Manley said. The device was left in front of a single-family home in the northeast part of Austin.

The second attack Monday happened around 11:50 a.m.

\"The victim in this incident came outside of her residence and found a package out front and picked up that package,\" Manley said.

Unknown motive

\"We don't know the motive behind these\" attacks, Manley said, although two homes targeted had African-American residents and another the elderly Hispanic woman. \"We cannot rule [out] that hate crime is at the core of this, but we're not saying that's the cause as well.\"

Police are not ruling out terrorism as a motive, either, because they don't want to \"limit\" what they are investigating, Manley said.

Evidence is being collected and sent to the ATF lab in Walnut Creek, California, so investigators can attempt to reconstruct what was in the explosive device, an ATF special agent said Tuesday afternoon.

$65,000 reward

Texas Gov. Greg Abbott has offered a $15,000 reward for information leading to the arrest of the person or people responsible for the explosions.

“I want to assure all Texans, and especially those in Austin, that local, state and federal law enforcement officials are working diligently to find those responsible for these heinous crimes,” Abbott said in a statement.

The ATF, FBI and Austin Police Department are offering an additional up to $50,000 reward for information leading to the arrest and conviction of those responsible. The Texas Department of Public Safety and the U.S. Postal Service as also assisting on the task force team, as well as the Travis County district attorney, who is \"setting this case up for prosecution\" when a suspect is captured, Manley said.

ABC News' Alex Perez and Gina Sunseri contributed to this report.

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