Investigators Believe Serial Bomber Behind Fourth Explosion in Austin, Texas

Theory Emerging on Motive of Austin Bombings

Investigators located the ethnic Chechen brothers who carried out the deadly Boston attack only after releasing photos of the pair to the public, four days after the bombing.

In the earlier bombings, two African-American men were killed by packages left on their doorsteps, raising the possibility of a racially motivated crime.

"We've said from the beginning that we're not willing to rule anything out, just because when you rule something out you limit your focus", Manley said in an interview Monday on Good Morning America. Anthony House, 39, died on 2 March. The explosion also critically injured his mother.

Initially, police said it was being treated as a "suspicious death", and that police didn't have "any indication that this is anything part of a larger scheme". Investigators are still working to determine how the package got there and if House was the person who was being targeted. Then, early Sunday, police issued a message to the bomber, asking him to reach out to explain himself, and that they were ready to talk. They suspect a serial bomber is behind the violence.

On Saturday, Austin police arrested 26-year-old Trevor Weldon Ingram for making a bomb threat at the South by Southwest festival, targeting a venue where popular hip-hop band The Roots was scheduled to perform that night. A woman in her 40s was taken to a hospital. She was seriously injured but is expected to survive.

Police later said they believe the two incidents are related.

Police searching for a motive behind the bombs said whoever was responsible was trying to send a message and should contact authorities.

The United States Postal Service told police that they reviewed their records, and they can confirm that the package did not come through the postal service.

The previous packages were all left at people's homes, authorities said.

Austin's police chief says the two men injured in the most recent bombing in Austin were riding or pushing bicycles when the explosives detonated.

Two men were wounded by the explosion Sunday night as they walked along a street and remained hospitalized in stable condition.

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Manley confirmed Monday that his department does have persons of interest, but can not identify a suspect at this time.

This is in addition to Governor Abbott's $15,000 reward.

He declined to identify the materials that were used to make them.

The FBI said on Twitter that its agents were at the scene of Sunday's explosion in a residential neighborhood on the west side of the city, several miles from where the east side neighborhoods where the earlier blasts occurred.

"The device's success, despite significantly different design, further suggests that the bomb maker behind these attacks is an accomplished one, and has likely to have received some training, perhaps as a military or police explosive ordnance disposal technician".

Austin police are investigating along with the Federal Bureau of Investigation and ATF.

"The belief that we are now dealing with someone who is using tripwires shows a higher level of sophistication, a higher level of skill", Manley said, warning that residents should not approach any suspicious items like backpacks, boxes or suitcases. But he says Sunday's differed in that it involved a tripwire whereas the others were package bombs left on people's doorsteps.

The Travis Country neighborhood was cordoned off by police and residents were told to stay indoors.

This is a developing story.

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