Updated at 10:30 a.m. Thursday, March 22 with new information about the bomber's targets.

The suspect who terrorized Austin for three weeks with a string of bombs had a list of future targets that included individuals and residences, an Austin congressman said Thursday.

Republican Rep. Michael McCaul, chairman of the Homeland Security Committee, told Fox News that Mark Anthony Conditt's list of future targets was found by investigators after Conditt died.

"We went to the homes and cleared them of any suspicious packages," McCaul said on "America's Newsroom" on Fox News.

Conditt left a 25-minute recording on his phone that detailed the seven bombs he constructed, including the one that may have killed him.

Acting Austin Police Chief Brian Manley said at a news conference late Wednesday that the 23-year-old left what he described as a confession on his phone and describing how he built the bombs.

"It was a confession. He didn't call it one. But he was admitting to what he had done," Manley said.

Conditt's motive didn't appear to be hate or terrorism, and he gave no reasons for the targets of his bombs, Manley said. The video appeared to be made between 9 and 11 p.m. Tuesday, when the chief said it appeared Conditt knew authorities were closing in on him.

"We are never going to be able to put a ration behind those acts," he said. " It is the outcry of a very challenged young man talking about the challenges in his life."

Manley said the video contained descriptions of the six bombs he had set off, along with descriptions of them. He also included details about how they were different, which gave authorities confidence that Conditt was indeed the suspect. He also spoke about a seventh bomb, which was the one he detonated early Wednesday morning while being pursued by officers.

At the same news conference, local, state and federal officials detailed their teamwork — and relief that Austin's nightmarish three weeks was over.

"It can never be called a happy ending, but it's a damned good one for the people of this community and the state of Texas," Travis County District Attorney Margaret Moore said. "The deaths that occurred here were absolutely random and meaningless and something we'll never get our heads around."

Austin was on edge after Conditt had accelerated his activity over the past week.

Anthony Stephan House, 39, was killed by a package bomb left on his doorstop in northeast Austin on March 2.

Draylen Mason, 17, was killed 10 days later, and his mother was also injured in the package bomb blast. That same day, Esperanza Herrera, 75, was injured in another package bomb blast. And on Sunday night, two men in their 20s were caught in a blast set off by a tripwire.

On Monday, a bomb exploded in a FedEx shipping facility in Schertz, near San Antonio.

More than 500 local, state and federal law enforcement personnel worked on the case. Their search became tighter after they caught Conditt on surveillance video dropping off a package bomb at a local FedEx office.

Police tracked him to a motel in Round Rock on Tuesday night. They used the footage that showed Conditt — alias Kelly Killmore on the packages he sent — in obvious disguise in a blond wig and hat, along with data ripped from his cellphone and his own car.

Manley said law enforcement officers willingly put their lives in danger to try to stop Conditt on Wednesday morning. After locating him at the motel off of Interstate 35, Austin police waited for other law enforcement to arrive on the scene. Before they did, Conditt drove away.

Knowing Conditt might make a run for it, Manley made the decision for officers to stop vehicle on the frontage road. Officers approached his car and started banging on the door, ordering him to open it. That's when he detonated the bomb, sending officers flying backwards.

"The men and women of the Austin Police Department put it on the line every single day for this community because we care," Manley said. "What happened last night. ... That video is harrowing to watch ... knowing the whole time they were willing to put their life on the line because of the danger this suspect had posed to our community."

The explosion injured one of the approaching officers, and at least one SWAT team member fired on the suspect. Manley said the medical examiner will determine whether a bomb or bullet killed Conditt.

Teamwork

Gov. Greg Abbott praised law enforcement's response to the attacks and highlighted the collaboration between federal, state and local authorities to "solve one of the most heinous crimes that's ever existed."

The Republican governor, who has at times tangled with Austin's Democratic leadership including on sanctuary policies, went out of his way to praise the city's response.

"In my time as 12 years as attorney general and three years as governor, I have not seen a better job than what we have seen from this police chief and this police force," Abbott said. "Chief, on behalf of everybody across the state of Texas, I want to say thank you for what you and your entire team has done. Today we proudly back the blue in Austin."

U.S. Attorney John F. Bash's voice broke when discussing the victims that law enforcement had been unable to help.

"It's good that we came together to do some good for the victims," he said.

Mark Conditt, shown in a photo posted to his mother's Facebook page in 2013. (Danene Conditt)

Alcohol, Tobacco, Firearms and Explosives Special Agent in Charge Fred Milanowski said Wednesday afternoon he's reasonably certain there are no other devices unaccounted for but still urged caution. Authorities were still searching Conditt's family home.

Pflugerville officials closed City Hall and evacuated residents near the Conditt home, telling them they couldn't return home until at least 9 p.m. while authorities searched the home for bomb-making materials and other evidence.

Conditt and Pflugerville

Conditt, 23, was home-schooled by his mother and attended Austin Community College's Northridge Campus from 2010-12. He did not graduate from the school, a spokeswoman said.

He reportedly worked for Crux Semiconductor in Austin and also repaired computers.

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Neighbors in Pflugervile, a 30-minute drive north of Austin, didn't appear to know much about the family.

The Conditt family home features a gray picket fence and an American flag. The neighborhood dates to the 1850s, when the small Austin suburb was settled.

Federal agents believe the suspect constructed all the bombs but won't rule out if he had help. Austin police tweeted Wednesday afternoon that two of Conditt's roommates had been detained. One was released, and the other was still being questioned. The roommates' names were not released because they are not under arrest, APD said.

Investigators have detained two roommates of the Austin bombing suspect. One roommate was detained, questioned and released. The other is currently being questioned. Their names will not be released because they are not under arrest at this time. APD PIO — Austin Police Dept (@Austin_Police) March 21, 2018

Austin Mayor confirms the man in the surveillance pictures is the same man killed by detonating bomb in a vehicle this morning. He is allegedly the Texas serial bomber. @KABBFOX29 @Ernie_Zuniga @Austin_Police pic.twitter.com/Q8cKY7KP3U — Breanna Barrs (@breannabarrs) March 21, 2018

The investigation

Texas Gov. Greg Abbott said authorities have also interviewed Conditt's family members and neighbors.

NBC News also reported that "exotic" batteries ordered online from Asia helped lead authorities to Conditt. Law enforcement officials told NBC that the unusual batteries used in the explosives were the signature trait that allowed investigators to so quickly link the various explosions to the same person.

These tips helped identify him, and authorities honed in on Conditt's home.

A search warrant also helped authorities trace the suspect's Google history, which included suspicious searches. Cellphone data had led to a hotel in Round Rock.

Austin Police track down serial bombing suspect to hotel near Round Rock. @KVUE sources say man detonated himself pic.twitter.com/NuMdGG4lAs — Jeremy Rogalski (@JRogalskiKHOU) March 21, 2018

ATF officials said they joined the FBI and Austin police "at the scene of the individual suspected" in the package bomb killings. Austin police had said earlier that they were investigating an officer-involved shooting at the location along Interstate 35.

Earlier, Austin's police chief identified the suspect as white. After victims were identified as black, speculation became widespread that the bombings could be racially motivated.

Investigators pursuing the suspected serial bomber had faced new threats along with the promise of valuable new leads as their attention shifted to a FedEx shipping center near San Antonio where a package exploded. An unexploded bomb also had been found near Austin's airport.

APD update in Round Rock on incident leading to IH-35 closure Update from Austin Police Department on the incident leading to the closure of southbound IH-35 in Round Rock this morning. Posted by Round Rock Police Department on Wednesday, March 21, 2018

Even as they pored through surveillance video footage and collected evidence, a scare Tuesday night led them to respond to a Goodwill store in southern Austin.

That turned out to be an unrelated explosion. Someone had dropped off a device sometimes used in military training and it went off, injuring a worker.

Police said they didn't believe that was the work of the bomber or a copycat. They said such military items are occasionally donated to Goodwill instead of being properly disposed of.

More emergency vehicles making their way to scene on I35 in Round Rock where Austin bombing suspect is now dead pic.twitter.com/6OfDiwGXIk — Melanie Barden (@MelanieCBS) March 21, 2018

Officials worked at the scene where a suspect reportedly blew himself up after a series of bombings terrorized Austin over the last month (Eric Gay / AP)

Also Tuesday, a criminologist at the University of Alabama said that if a single perpetrator was behind the blasts, changing the means of delivery would increase the bomber's chance of getting caught.

And during an Oval Office meeting Tuesday, President Donald Trump said whoever is responsible for the bombings "is obviously a very sick individual or individuals" and that authorities are "working to get to the bottom of it."

By 5:30 a.m. Dallas time, the president had tweeted: "AUSTIN BOMBING SUSPECT IS DEAD. Great job by law enforcement and all concerned!"

AUSTIN BOMBING SUSPECT IS DEAD. Great job by law enforcement and all concerned! — Donald J. Trump (@realDonaldTrump) March 21, 2018

Staff Writers Lauren McGaughy and Jackie Wang in Austin and Mede Nix in Dallas, The Associated Press and The Washington Post contributed to this report.