'Serial bomber' on the loose in Austin, Texas

2 injured by explosions in Austin, Texas on Sunday, marking third incident in a week

2 injured by explosions in Austin, Texas on Sunday, marking third incident in a week

Hours after the bombing Manley said it is "very possible" the device in Sunday night's explosion was triggered by a tripwire.

If the bomb maker used a remote, it would have "required the bomber to have had visual contact with his victim - potentially exposing him to detection", the Stratfor report said.

Two people have been killed and two others injured in three blasts from packages left on doorsteps this month.

Authorities maintain a cordon near the site of an incident reported as an explosion in southwest Austin, Texas, U.S. March 18, 2018.

Manley did the same yesterday when announcing a $100,000 reward for any information that could lead to an arrest - that's in addition to a $15,000 reward being offered by Gov. Greg Abbott's office.

Authorities warned that the devices appear to be getting more sophisticated and asked residents of one neighborhood to stay indoors.

The Sunday night explosion, which left two people wounded, appears to have been ignited using a trip wire, officials said. "When pressure puts on the wire, it activates detonated device", he said.

The latest explosion injured two white men - one 22, the other 23 - walking through part of Austin's southwest area, far from where the first three devices detonated.

"With this tripwire, this changes things", said Christopher Combs, special agent in charge of the FBI's San Antonio division. We need every tip, every piece of information, no matter how inconsequential it is...we've had a lot of good leads and tips come in.

Because of the darkness "we have not really had an opportunity to really look at this blast site to determine what has happened", he said. Race could still be a factor in the bombings, he added. We have state resources.

Investigators say the two victims saw a suspicious device on the side of the road and approached to investigate, setting off the blast.

Man stabbed to death had connection to Natalee Holloway, murder case
Ludwick claimed that her remains had been buried in Aruba, and said van der Sloot paid him $1,500 to exhume the remains in 2010. Despite global media attention, Holloway's body was never found and a court in Alabama ruled her legally dead in January 2012.

In response, the Austin Independent School District kept school buses out of the neighborhood, and police are warning residents to act with caution. It urged anyone in the "4800 block of Dawn Song Dr." to avoid the area. Grote said one of them was riding a bike in the street and the other was on a sidewalk when they crossed a tripwire that he said knocked "them both off their feet".

While the demographics of victims run the gamut, "We are clearly dealing with what we expect to be a serial bomber at this point", Manley said. He says concern is growing because "the methodology has changed".

"If you have video surveillance on your house, we want to get your video footage so that we can have that analyzed and identify any potential suspicious persons, vehicles, or anything that may be interest to this investigation", he added.

The first two bombs killed black people - a 39-year-old construction worker and a 17-year-old high school student - related to prominent members of Austin's African-American community who were also close friends.

'Again, airplanes go by and cars backfire so we didn't think much of it.

He said investigators will not rest until the individuals behind the attacks are brought to justice.

"That anxiousness is going to continue until we can find the answer", Adler said. Police did not allude to the possibility of investigating a hate crime in the fourth explosion.

Stan Malachowski, who lives about half a mile away, said he heard a loud explosion.

Manley said the three previous package bombings "were meant to send a message".

Hundreds of law enforcement officers have responded to the attacks.

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