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Interim Austin police Chief Brian Manley said the victims in the first two explosions were black and the third explosion's victim was Hispanic.
This last confirmed explosion follows three others in the month of March - two of which were deadly.
Austin Police Chief Brian Manley, flanked by partners from the ATF and the Federal Bureau of Investigation, announces a reward for a tip that leads to an arrest in a string of package bombings has been increased to $115,000 on Sunday, March 18, 2018.More news: Patrick's Day celebration in NYC
As reported by The Washington Post, the series of explosions in Austin has so far claimed the lives of two people, namely a 17-year-old boy and a 39-year-old man. Later that day across town, a 75-year-old woman was injured when she also found a odd package on her porch. We can not ignore that.
"There's a certain level of skill and sophistication that whoever is doing this has, and. we are hoping to use the evidence we have to track them down based on what we are seeing on all three scenes that seem to be consistent", Manley to KXAN news on Tuesday. "They brought that package inside the residence, and as they opened that package, both victims were in the kitchen, and the package exploded, causing the injuries that resulted in the young man's death and the injuries to the adult female". "That does not indicate it's a hate crime, but we are not going to rule that out".
Investigators have not identified a motive or possible ideology behind the bombings and said they will likely not understand what the bomber's intention was until they come forward.
Hundreds of people have called the Austin Police Department to report suspicious packages after two violent explosions Monday, March 12.
Police have received more than 735 calls about suspicious packages since the three parcel bomb attacks, but authorities had not found any that posed a security risk, Manley said.
Investigators say the devices were being left on doorsteps overnight, not being delivered by official methods. He wouldn't go into detail as to the writing on the boxes.