Austin Police Arrest Man After Months of Late Night Explosions

Months-Long Terror Ends with Federal Investigation

After four months of mysterious late-night explosions that shook neighborhoods near St. Edward's University in Austin, Derek Austin Gillespie, 49, was arrested at his home on Lightsey Road on Tuesday and charged with possessing explosive devices, a third-degree felony . The arrest marked the end of a complex federal investigation that involved multiple agencies working to track down the source of improvised explosive devices that had terrorized South Austin residents since August.

The investigation began in August after calls to police and 311 about loud booms overnight near Blunn Creek near St. Edward's University . What initially appeared to be fireworks quickly escalated into a serious federal case when the APD Bomb Squad responded to an explosion in the 2500 block of Jones Road and collected evidence of an improvised explosive device .

According to an affidavit from the Travis County District Clerk, a caller said someone appeared to throw a "homemade firework with metal" and that they saw a bright blue light . The incidents proved far more dangerous than typical fireworks, with witnesses telling police they heard a loud bang, strong enough to make them believe a house had exploded .

Federal Task Force Mobilizes

The complexity and potential danger of the case prompted an unprecedented multi-agency response. The APD Bomb Squad, Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) investigators and explosive specialists, and Austin Fire collaborated with the Federal Bureau of Investigation (FBI) Central Texas Joint Terrorism Task Force, the Austin Regional Intelligence Center and the U.S. Marshals Lone Star Fugitive Task Force .

The investigation intensified as reports continued through fall. Six other incidents were reported in November, with explosions on the 200 block of Lightsey Road on Nov. 3, more booms at South 1st St. and West Elizabeth St. on Nov. 6, and two additional explosions on Nov. 9 . Each incident provided crucial evidence that helped investigators build their case.

A breakthrough came when St. Edward's University security footage showed what appeared to be a silver 2009-2011 Honda Civic with an EX or EXL trim, stickers on the driver's side window and a black driver side mirror . This surveillance evidence proved instrumental in identifying Gillespie as the primary suspect.

Cache of Explosives Discovered

On December 16, 2025, investigators executed a search and arrest warrant in the 500 block of Lightsey Road, where multiple improvised explosive devices were located inside the suspect's residence and vehicle . The discovery revealed the true scope of the threat Austin residents had been facing. Authorities found five explosive devices in the trunk of a vehicle, according to an APD search warrant .

Court documents revealed additional disturbing details about Gillespie's activities. An APD officer located an incident where Gillespie drove a vehicle and threw a firework out of the window that exploded close to a patrol vehicle, and when asked during a traffic stop, he showed a firework that did not match the devices found by the Bomb Squad, while a fire extinguisher and suspected homemade explosive device were found in his vehicle .

No injuries have been reported related to the incidents and investigators do not believe there is an ongoing threat to the public . Gillespie was being held in the Travis County Jail on a $100,000 bond as of Thursday .

Community Vigilance Proves Critical

Law enforcement officials emphasized how community reporting proved essential to solving the case. Those calls helped investigators find a pattern that ultimately led to Gillespie's arrest, with APD Chief Lisa Davis saying "Thanks to the dedication of our officers, partner agencies, and community members who reported suspicious activity, we were able to stop behavior that posed a serious risk to public safety" .

The case demonstrates how modern law enforcement combines traditional investigative techniques with advanced surveillance technology and multi-agency coordination. FBI Acting Special Agent in Charge Alex Doran noted that through collaboration with Austin Police and their ability to leverage the collective investigative expertise of the Central Texas Joint Terrorism Task Force, they were able to identify the suspect .

This investigation serves as a reminder that suspicious activity should always be reported to authorities, as community vigilance remains one of the most effective tools in preventing potential threats before they escalate into serious public safety incidents.