The father of the first Austin bombing victim, 39-year-old Anthony Stephan House, thanked local and federal law enforcement officers for their handling of the investigation in a letter released Thursday that also questioned the meaning behind the attacks.

"I wish to express my deepest appreciation for the exhaustive efforts and work of the Austin Police Department, the Federal Bureau of Investigation, the Alcohol, Tobacco, and Firearms agency, and other agencies that participated in this investigation of the series of explosive devices," Elliot House, Anthony House's father, wrote in a letter first reported by CBS News.

"Hopefully, the death of the bomb maker suspect ends the ring of fear and terror in the Austin area, although it leaves a few questions, shared with both the family of my son, Anthony House, and 17-year-old Draylen Mason, both being black and the only deaths in the series of bombings," House continued. "We are plagued with how they were selected and why."

Austin police have identified the people killed in two separate package explosions as Draylen Mason, left, and Anthony House. Mason died in a bombing Monday morning. House died after an explosion March 2. Photos: Courtesy of Kylie Phillips and Norrell Waynewood.
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Anthony House was the father of an 8-year-old girl and a Texas State University graduate.

Elliot House said he also appreciated the “personal condolence” from Christopher Combs, the FBI’s special agent in charge of the San Antonio Field Division, and Mayor Steve Adler. House noted that he especially appreciated that Adler “apologized for the initial investigation of the bombing involving my son by APD.”

Many in the community have criticized the Austin Police Department for its handling and characterization of the first bombing. Several people in an East Austin town hall last week questioned whether Austin police would have more readily sounded the alarm and warned the community about the package bombs sooner had the first bombing killed a white person in a neighborhood west of Interstate 35.

Elliot House expressed his grief, saying that the death of his son in the bombing left him childless, as his other son, Corey Alan House, was killed in 1994 at age 17.

“I have no more sons. I continue to mourn my losses,” House wrote in the letter to authorities. “But continue the good work.”