Authorities work on the scene of an explosion in Austin on Monday, March 12, 2018. Two package bomb blasts a few miles apart killed a teenager and wounded two women in Austin on Monday, less than two weeks after a similar attack left a man dead in another part of the Texas capital. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities work on the scene of an explosion in Austin on Monday, March 12, 2018. Two package bomb blasts a few miles apart killed a teenager and wounded two women in Austin on Monday, less than two weeks after a similar attack left a man dead in another part of the Texas capital. (Ricardo B. Brazziell/Austin American-Statesman via AP)

AUSTIN, Texas (AP) — Families of two people killed by package bombs left on their doorsteps in Austin knew each other and were connected through local activism in the black community, a civic leader said Tuesday. But it was not clear how they might be tied to a third household where a package bomb also exploded.

Investigators have said the three blasts that killed two people and wounded two others could have been hate crimes since all the victims were black or Hispanic. But they also said they have not ruled out any possible motive.

Draylen Mason, 17, was killed and his mother wounded when a package bomb was opened Monday in their kitchen. The teen’s grandfather is Norman Mason, a prominent dentist in east Austin. He was friends with Freddie Dixon, stepfather of 39-year-old Anthony House, who died in a similar attack in another part of the city on March 2, said Nelson Linder, president of the Austin chapter of the NAACP.

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“I don’t believe in coincidences,” Linder said, explaining that he was concerned by the fact that the families were acquainted.

Still unknown is what connection — if any — the two families had to a third household where another package bomb exploded Monday, wounding a 75-year-old Hispanic woman who remains hospitalized in critical condition but has not yet been identified.

Austin Police Chief Brian Manley said he was aware of the connection but did not know if would affect the case.

“Our detectives are currently looking at that to evaluate that lead and to see if it is in fact relevant to what we are investigating,” Manley said.

Business records indicate that Dixon was a leader of Austin’s African American Cultural Heritage District, or “Six Square,” which the city defines as 6 square miles of east Austin that was originally created as the Negro District by the Austin City Council in 1928. He also was a longtime pastor at Wesley United Methodist Church, one of the city’s oldest historically black churches.

Dixon was quoted by the Austin American-Statesman in 2015 lamenting how Austin’s population growth and prosperity were effectively creating economic segregation by raising the cost of living.

“Austin is quickly becoming a city of the privileged and the non-privileged,” Dixon told the newspaper. “Is that the kind of Austin we want?”

Linder said Austin’s minority community is on edge following the bombings.

“Given the fact these people are people of color, that definitely gets people’s attention,” he said. “They feel vulnerable, and they should based on the nature of the incidents.”

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The FBI and other federal officials continue to assist in the investigation. Manley said, “We’re not saying that we believe terrorism or hate is in play, but we absolutely have to consider that because we don’t want to limit what we are investigating, what we are considering and how we are approaching this case.”

Tina Sherrow, a retired agent for the Bureau of Alcohol, Tobacco, Firearms and Explosives, said the materials to build such bombs are commonly available at hardware stores or online, and that police have been mum on details because the perpetrators may be watching media coverage.

“I don’t look at it as terrorism, but it’s terrorism of a community for sure,” Sherrow said.

The package explosives were not delivered by the U.S. Postal Service or any private carrier but left overnight on doorsteps. Still, Manley urged Austin residents to call 911 if they receive any unwanted packages that look suspicious. Authorities responded to 250-plus calls about parcels without finding any that were explosives.

Austin police are offering a $50,000 reward for information leading to an arrest, Manley said. That’s in addition to the $50,000 that Texas Gov. Greg Abbott has already offered.

Manley said he could not divulge too many details about the packages, saying those responsible could vary their future tactics. But he said the packages were “not at all identifiable” as a standard shipping box or standard shipping labels would be.

Investigators collecting evidence continued to come and go, and yellow police tape still marked off the sites of Monday’s two blasts, which occurred about 5 miles apart.

At the site of the March 2 bombing, there were no police, but the door to the red-brick house where the package exploded was still boarded up.

There’s nothing obvious linking the three neighborhoods, other than all were east of Interstate 35, which divides the city. The east side has historically been more heavily minority and less wealthy than Austin’s west side, although that has changed as gentrification has raised home prices and rents everywhere.

The blasts occurred during the South By Southwest music festival, which attracts hundreds of thousands of visitors to Austin each March. But they happened far from the main events and concert venues.

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Associated Press writers John Mone and Jim Vertuno in Austin and Randy Herschaft, in New York contributed to this report.

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This story has been updated to correct Mason’s first name to Norman, instead of Dixon, and to correct the spelling of Freddie Dixon’s first name.