Two people were injured in another explosion in Texas' capital Austin, the fourth mysterious bombing in the city this month, sparking panic among residents and leading authorities to believe that they are dealing with a "serial bomber".
The explosive packages were not delivered by the US Postal Service or any other mail delivery service, so someone hand-delivered them, likely overnight, to the three Austin homes, the Stratfor report says.
Showing homes this afternoon, Womack said she would be taking more care especially working with buyers bringing children, making sure they were keeping a close eye on them, she said.
He added that the most recent attack is why police didn't release details on the package bombs, so that Austin residents wouldn't be looking for only one kind of suspicious device.
A reward of United States dollars 115,000 has been offered for information leading to the arrest and conviction of the person or people responsible for the mysterious blasts.
The latest blast, which injured two men while they were walking along the road in a residential area, plunged the city further into a frightening mystery that forced residents in the vicinity of the bombing to remain locked in their homes as investigators scoured the area for answers.
Austin Police Chief Brian Manley confirmed in a media briefing Monday that the device that set of an explosion Sunday night in Austin, Texas was detonated after a trip wire was broken by one of the individuals, indicating that the newest device showed "a higher level of sophistication" and skill.
Fred Milanowski, agent in charge of the Houston division of the federal Bureau of Alcohol, Tobacco, Firearms and Explosives, said the latest bomb was anchored to a metal yard sign near the head of a hiking trail. He said the wire could be either a filament or fishing line that is hard to spot.
The latest explosion injured two men in their 20s who were riding or walking their bicycles through a neighborhood in southwestern Austin.
"Given the darkness, we have not really had an opportunity to really look at this blast site to determine what has happened", the chief said. Race could still be a factor in the bombings, he added.
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In a late-night press conference, Manley warned people in the neighborhood to stay inside until the crime scene could be processed in daylight.
Manley urged residents to be even more cautious than they have been before. Police said their conditions were stable. "Any tardies or absences due to this situation will be excused", the district posted on Facebook.
"That's why we're pushing the message out there that we need every tip, every piece of information however inconsequential you may think it is", Manley said. He says concern is growing because "the methodology has changed".
"It is very possible that this device is a device that was activated by someone either handling, kicking or coming in contact with a tripwire activating the device", Manley said earlier.
"I tell you, at this point there's not enough data to know that", Adler said on GMA this morning.
Additional reporting from Newsy affiliate CNN.
Investigators said the tripwire is the main difference between Sunday's attack and the others.
"This has to be a community response", Manley said Monday morning.
"We're not believing that this was similar to previous ones, as in packages left on doorsteps".
"There are probably more law enforcement officers per capita in Austin than there has ever been before", Gov. Abbott reported".