March 12, 2018 02:10 PM

A 17-year-old boy was killed and two women were injured after the explosion of two packages in Austin, Texas, on Monday, PEOPLE confirms.

At 6:44 a.m. Monday, a call came in after a package exploded on Old Fort Hill Drive, killing the 17-year-old and injuring a woman in her 40s. The second explosion, which took place at 11:49 a.m., injured a woman in her 70s, Austin police announced on Twitter.

The explosions occurred more than five miles apart.

At a news conference on Monday, interim Austin Police Chief Brian Manley said the explosions were similar to one that killed a man in Austin on March 2 and authorities believe the cases are linked.

Previously, that case — which also occurred in the morning, when the victim found a package on his front steps that exploded — was being investigated as a suspicious death but is now being investigated as a homicide.

The March 2 fatal victim was an African-American man as was the fatal victim on Monday, authorities said. The second of Monday’s bombings injured a 75-year-old Hispanic woman.

According to multiple reports, the victim of the March 2 incident was identified as 39-year-old Anthony Stephan House.

Anthony Stephan House
Sarah Navoy/Facebook

Speaking about the first of the two explosions on Monday, Chief Manley said police don’t believe the package came from the U.S. Postal Service.

There is no known motive for the explosions at this time, police said. When asked if authorities believe the incident was terrorism, an Austin police spokeswoman tells PEOPLE: “We’re not ruling out what this could be.”

Manley said authorities “cannot rule out that [a] hate crime is at the core of this, but we are not saying that’s the cause as well. We are just looking at any possible motivations that would link these two cases together.”

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Authorities investigate the scene in east Austin, Texas, after a teenager was killed and a woman was injured in a package explosion on Monday.
Authorities investigate the scene in east Austin, Texas, after a teenager was killed and a woman was injured in a package explosion on Monday.
Ricardo B. Brazziell/TNS/ZUMA Wire

The FBI has responded to both locations, says Michelle Lee, a spokeswoman for the bureau’s field office in San Antonio, Texas.

Lee did not describe the packages used in the explosions but tells PEOPLE, “They look legitimate enough to handle,” adding, “We’ve had three individuals handle them.”

The FBI and Austin police are asking the public not to touch or open unexpected or suspicious packages. People who receive a suspicious package should call 911 or 512-974-2000.

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