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Longtime neighbors of Austin, Texas, serial bomber Mark Anthony Conditt said they "absolutely" saw no signs that he would be capable of such destruction.

Authorities say Mark Anthony Conditt, 23, created multiple explosive devices, which killed two people and injured four others in a string of bombings in the Texas capital.

Conditt blew himself up near a motel parking lot early Wednesday as a SWAT team approached his vehicle.

Nancy and Jeff Reeb lived next door to Conditt family for approximately ten years, starting when Mark Anthony Conditt was five years old.

"I saw him and I still see him as the little five year old who moved in next door who I was so glad to see move in because it gave my grandson a playmate. And for the next ten years, Mark, his little sister, my grandson just had an ideal life [and] time together growing up," Nancy Reeb said.

Jeff Reeb said the Conditts were nice, caring and great neighbors, and the Reebs never observed any signs that Mark Anthony Conditt was troubled.

"Absolutely nothing comes to mind. Granted, we knew him as a kid and an early teenager, not so much after he got out of high school," he said.

Nancy Reeb said something must have happened to turn the little boy they knew into a man who was capable of such horrible things.

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