By Associated Press

Published: 05:25 GMT, 13 March 2018 | Updated: 05:25 GMT, 13 March 2018

AUSTIN, Texas (AP) – Three package bombs left on doorsteps in suburban neighborhoods have exploded in less than two weeks in Texas’ capital city, killing two people and wounding two others.

Police say the bombings in eastern Austin are likely linked. Two occurred Monday and one on March 2.

All the victims were minorities, and investigators are looking into whether race was a factor. However, they backed off initial suggestions that hate crimes could be a core cause.

Authorities investigate the scene after multiple explosions in Austin on Monday, March 12, 2018. Police are responding to another explosion Monday, that badly injured a woman, hours after a package bomb killed a teenager and wounded a woman in a different part of the city. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities investigate the scene after multiple explosions in Austin on Monday, March 12, 2018. Police are responding to another explosion Monday, that badly injured a woman, hours after a package bomb killed a teenager and wounded a woman in a different part of the city. (Ricardo B. Brazziell/Austin American-Statesman via AP)

The attacks unfolded as tens of thousands of visitors arrived for the busiest days of South By Southwest. The festival didn’t appear related to the incidents.

People receiving unexpected packages in Austin are being urged to not handle them and to call 911.

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)

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 speak to the media after multiple explosions in Austin on Monday, March 12, 2018. Police are responding to another explosion Monday, that badly injured a woman, hours after a package bomb killed a teenager and wounded a woman in a different part of the city. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities speak to the media after multiple explosions in Austin on Monday, March 12, 2018. Police are responding to another explosion Monday, that badly injured a woman, hours after a package bomb killed a teenager and wounded a woman in a different part of the city. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities speak to the media after multiple explosions in Austin on Monday, March 12, 2018. Police are responding to another explosion Monday, that badly injured a woman, hours after a package bomb killed a teenager and wounded a woman in a different part of the city. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas' capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas' capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas’ capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas' capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas' capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas’ capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities investigate an explosion at a home in Austin, Texas, Monday, March 12, 2018. Investigators believe the fatal explosion on Monday is linked to another deadly bombing elsewhere in the city this month, and they're considering whether race was a factor because all of the victims were black. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities investigate an explosion at a home in Austin, Texas, Monday, March 12, 2018. Investigators believe the fatal explosion on Monday is linked to another deadly bombing elsewhere in the city this month, and they're considering whether race was a factor because all of the victims were black. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities investigate an explosion at a home in Austin, Texas, Monday, March 12, 2018. Investigators believe the fatal explosion on Monday is linked to another deadly bombing elsewhere in the city this month, and they’re considering whether race was a factor because all of the victims were black. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities investigate an explosion at a home on Galindo Street in Southeast Austin, Texas, on Monday, March 12, 2018. The incident was the second reported explosion on Monday and the third in two weeks. Medics were sent out to the 6700 block of Galindo Street, near Montopolis and East Riverside drives in Southeast Austin at 11:49 a.m., EMS said. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities investigate an explosion at a home on Galindo Street in Southeast Austin, Texas, on Monday, March 12, 2018. The incident was the second reported explosion on Monday and the third in two weeks. Medics were sent out to the 6700 block of Galindo Street, near Montopolis and East Riverside drives in Southeast Austin at 11:49 a.m., EMS said. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities investigate an explosion at a home on Galindo Street in Southeast Austin, Texas, on Monday, March 12, 2018. The incident was the second reported explosion on Monday and the third in two weeks. Medics were sent out to the 6700 block of Galindo Street, near Montopolis and East Riverside drives in Southeast Austin at 11:49 a.m., EMS said. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas' capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas' capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)

Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas’ capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)

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