How police tracked down the suspected Austin serial bomber Mark Anthony Conditt

Mary Bowerman | USA TODAY

Show Caption Hide Caption What we know: Austin bomber's final moments Authorities say the suspected bomber responsible for two deaths and several injuries in Texas has died from a self-inflicted explosion.

The man suspected of carrying out a string of bombings that killed two people and wounded several others in the Austin area is dead after detonating a bomb in a car as SWAT teams closed in.

Authorities tracked down the suspect, identified as Mark Anthony Conditt, 24, using a combination of cell phone triangulation technology, surveillance footage from a FedEx drop-off store, store receipts, and combing through Google searches on the suspect's computer history, KVUE-TV and the Austin American-Statesman report.

Austin Police Chief Brian Manley said in an early morning press conference that witness reports helped police identify the vehicle Conditt was driving. Manley said surveillance teams then tracked the suspect's vehicle to a hotel in Round Rock, Texas.

"We had multiple officers from both the police department and our federal partners that took up positions around the hotel awaiting the arrival of tactical teams," Manley said. "We wanted to have ballistic vehicles here so we could attempt to take the suspect into custody."

Manley said that while authorities waited for the ballistic vehicles, the suspect started to drive away from the hotel. Authorities followed the vehicle, which pulled off into a ditch.

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"As members of the Austin police department SWAT team approached the vehicle, the suspect detonated a bomb inside the vehicle, knocking one of our SWAT officers back, and one of our SWAT officers fired at the suspect as well," Manley said.

The suspect died in the vehicle, according to Manley.

Manley said authorities still do not know the motive for the bombings.

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Four bombings in Austin since March 2 have killed two people and wounded four. A fifth person suffered minor injuries when a package bomb exploded at a FedEx facility early Tuesday in Schertz, near San Antonio. That package was mailed from Austin, linking it to the serial bomber.

Another package found at a separate FedEx center in Austin later Tuesday had a bomb inside but was "disrupted" by law enforcement before it exploded, the FBI said in a statement.

One person was injured in Austin after an "incendiary device" was found at a Goodwill store Tuesday, but police said that incident did not appear be related to the other bombings.

Manley warned Austin-area residents to stay vigilant and stressed that police do not know where Conditt was over the last 24 hours.

"Throughout these weeks we've talked about the importance of remaining vigilant and looking out for each other," he said. "I want to continue that message as we stand here this morning because we don't know where this suspect has spent his last 24 hours and therefore we need to remain vigilant to ensure that no other packages or devices have been left in the community."

Contributing: Jane Onyanga-Omara, Christal Hayes, John C Moritz and John Bacon