Officials discovered a bomb-making room in Mark Anthony Conditt’s home in the Austin suburb of Pflugerville as well as a “target list” with “additional addresses we believe he was using for future targets."

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PFLUGERVILLE, Texas — Investigators have discovered that the serial bomber who kept Austin on edge in recent weeks had a list of future targets and had set up a room in his home to manufacture bombs, officials said Wednesday.

After hundreds of investigators swarmed Austin in recent days to stop the serial bomber in Texas’ capital city, it was a combination of high-tech surveillance and old-fashioned shoe leather that led officials to Mark Anthony Conditt, 23, a native Texan who had no apparent motive or criminal record.

The six bombs used similar components that made it easy for officials to link the devices: unusual batteries, apparently purchased online from Asia, and nails used as shrapnel, according to U.S. Rep. Mike McCaul, the Republican chairman of the House Homeland Security Committee.

Trying to find the buyer of the nails, officials “went to every hardware store” in the area to find buyers who had made large purchases, and they struck gold with a Home Depot store in the Austin suburb of Round Rock, McCaul said in an interview with the Los Angeles Times.

“The fatal mistake that led law enforcement to him — because he was pretty good at evading surveillance cameras — was when he walked into Home Depot,” McCaul said. Investigators obtained surveillance footage of Conditt walking into the store in a wig but then walking out to a vehicle with a license plate connected to his name.

From there, McCaul said, investigators obtained a cellphone number linked to Conditt that had been turned off for “a while” — until Wednesday morning.

Conditt turned on the phone, McCaul said, allowing investigators to locate him at a hotel in Round Rock, which led to a police chase that ended with Conditt killing himself early Wednesday with an explosive in his red SUV.

Officials, who discovered a bomb-making room in Conditt’s home in the Austin suburb of Pflugerville, haven’t offered any theories for why Conditt embarked on a bombing campaign that left two dead, four injured and an entire city unnerved.

But they discovered at least one chilling piece of evidence after the hunt was over: a “target list” with “additional addresses we believe he was using for future targets,” McCaul said. The target list was not released.

Even now, with a road map, figuring out a reason Conditt picked the targets he did is difficult. “It’s hard to make any rhyme or reason out of the victims,” McCaul said.

Investigators detained and questioned two roommates of the Austin bombing suspect Wednesday as officials sought to determine whether Conditt had any help in the string of bombings.

One of the roommates has been released, while the other was still being questioned late Wednesday, Austin police said in a statement on Twitter, declining to release any names since no charges had been filed.

Officials also said they had filed a federal bomb-possession charge and arrest warrant against Conditt late Tuesday, shortly before he died.

“Hundreds of federal, state and local law-enforcement officers worked together to identify and locate Conditt,” U.S. Attorney John F. Bash said in a statement.

A portrait emerged Wednesday of an introverted Christian conservative who had been home-schooled and worked at a local manufacturing company before being fired last year.

In a statement released to CNN, Conditt’s parents said they were in shock and grieved for the victims in the bombings.

“We are devastated and broken at the news that our family could be involved in such an awful way,” the family said. “We had no idea of the darkness that Mark must have been in.”

In Pflugerville, federal and local law-enforcement officials searched two sheds and trash bins outside the Conditts’ home. The shades were drawn, and a U.S. flag flew out front.

Conditt took classes at Austin Community College between 2010 and 2012 and was home-schooled, according to college officials and social-media posts from his mother, who said he graduated high school in 2013.

“He’s thinking of taking some time to figure out what he wants to do … maybe a mission trip,” said a Facebook post from Danene Conditt, which included a photo of Mark Conditt.

In an old blog under Mark Conditt’s name, started apparently as part of a community-college class assignment, the author wrote in 2012 that he was conservative but “not that politically inclined,” writing posts opposing abortion, favoring the death penalty and arguing that gay marriage should be illegal.

“I view myself as a conservative, but I don’t think I have enough information to defend my stance as well as it should be defended,” read the blog’s biography page. “The reasons I am taking this class is because I want to understand the US government, and I hope that it will help me clarify my stance, and then defend it.”

In a post in favor of the death penalty, the author wrote, “Living criminals harm and murder, again — executed ones do not.” The blog’s final post is dated May 2012.

One of Conditt’s former friends, Jeremiah Jensen, 24 — who was home-schooled in Pflugerville and attended the community college at the same time as Conditt — said that Conditt’s blog posts for class were being taken out of context in media reports.

“Certainly a lot of the home-school community in Pflugerville, Texas, is conservative and a lot of kids were raised that way,” Jensen said. “I think a lot of people jump to conclusions and want to make him out to be a conservative terrorist. But I think it has more to do with loneliness and anger than it has to do with anything else.”

Conditt was smart, “strait-laced” and “definitely came off as a little intense, and it was hard for him to get along with people and make friends,” said Jensen, now a freelance journalist living in Dallas. “A lot of people didn’t really understand him or how to speak his language.”

Community-college officials said he was a business- administration major and did not graduate. His last classes were in 2012.

Conditt, who had two younger sisters, moved away from home in recent years and bought a house but returned to visit, neighbor Jeff Reeb said.

Reeb said he saw the Conditts daily and last saw the suspect visit his parents last week — which would have been after the bombings began.

“I was hoping they were wrong,” Reeb said of reports identifying Mark Conditt as the bombing suspect, adding that he didn’t recognize Conditt in surveillance footage from an Austin FedEx store that showed the bomber with long, blond hair.

Conditt worked for several years at a local semiconductor manufacturer, Crux Manufacturing, before he was fired in August for poor performance, according to KVUE-TV.

The business’ owner, who spoke to the television station anonymously, said Conditt worked in purchasing and sales. “He was very quiet and introverted” and did not have any confrontations with management,” the owner said, adding that he was given several warnings for not meeting expectations before he was fired. “He would prioritize things in his own way.”

Investigators began zeroing in on Conditt in the past two days, and officials were moving to make an arrest at the hotel in Round Rock when Conditt began driving away, Austin Police Chief Brian Manley said at a news conference.

The vehicle ran into a ditch, and as officers approached, the suspect detonated an explosive that killed him and knocked one officer back, Manley said. Police fired a single shot at the car.

Conditt’s death followed days of rapid developments in the case.

On Tuesday, a bomb inside a package exploded on a conveyor belt at a FedEx shipping center in Schertz, northeast of San Antonio and about 60 miles from Austin. One worker was treated at the scene for minor injuries.

It was the fifth in a series of bombings this month.