(Natural News) For the second and third time in a month, two hand-delivered bombs detonated in Austin, Texas, killing at least one person and injuring two others at separate locations.

According to local media, the first explosion on Monday occurred in the 4800 block of Oldfort Hill Drive in East Austin. That bomb killed a 17-year-old teen and injured a woman believed to be in her 40s.

A while later, a second explosion injured a 70-year-old woman in the 6700 block of Galindo Street in southeast Austin. Travis County emergency medical personnel transported the woman to Dell Seton Medical Center with "serious and potentially life-threatening injuries," according to the Austin Statesman newspaper.

The paper noted further:

Hours after [the second Monday] incident, interim Austin Police Chief Brian Manley said that explosion appeared similar and likely related to another explosion in Northeast Austin on March 2.

Authorities on Monday also warned residents against taking suspicious packages inside their homes.

The incidents are being investigated by police and federal authorities, as a homicide, the chief said.

He also said that investigators were not ruling out the possibility of the explosions being a hate crime because the victims in those cases are African-American.

U.S. Postal Service officials have told local authorities that the packages delivered to the two addresses did not come through any of their facilities. Manley said that means they were very likely hand-delivered by someone. (Related: Proof that 'Black Lives Matter,' Antifa are nothing more than anarchist groups.)

He added that authorities are aware of the kind of explosives that were used in Monday's bombings but are not releasing the details in order to preserve the integrity of the investigation, the Statesman reported.

"We will not tolerate this in Austin," he told reporters.