AdvertisementInvestigators Say Austin 'Serial Bomber' May Have Used Tripwire In Latest BlastMarch 19, 2018Laurel WamsleyfacebookEmailAustin Police Chief Brian Manley (from left), ATF Special Agent in Charge Fred Milanowski and FBI Special Agent in Charge Christopher Combs at a news conference on Monday in Austin, Texas. They said a bomb that exploded Sunday night appeared to have used a tripwire. (AFP/Getty Images)