( CNN ) -- Robin Dehaven usually replaces windows . On Thursday morning , after a small plane crashed into an Austin , Texas , office building , he was breaking them , having rushed into the burning structure to help people escape . Dehaven , an Army veteran who works for a glass company , was driving to a job when he witnessed the plane crash . With the building in flames and emergency personnel still minutes away , Dehaven drove his truck to the parking lot . People in the building were trapped , screaming for help . `` [ Other people who 'd gathered ] said they needed my ladders on my truck , because there were people stuck on the second floor , '' Dehaven told CNN 's `` The Situation Room . '' He took a ladder off his truck and put it up to a window of a smoke-filled area where five people were trapped . `` The people were kind of in a panic , wanting to get out quickly , of course , so I climbed up into the building with them , '' Dehaven said . He then broke a nearby window under which the ladder could have better footing , and he helped the five escape , he said . See iReport photos and videos from the scene . Dehaven was one of several people who rushed to the site to help , local reports and the Texas governor 's office said . `` In true Texas form , first responders and everyday citizens responded to today 's plane crash with selfless acts of heroism , securing the area , evacuating the building and controlling the fire , and are to be commended , '' Texas Gov . Rick Perry said in a written statement Thursday . Authorities said they believe pilot Joseph Andrew Stack III , 53 , of Austin , intentionally crashed the small aircraft into the building , where nearly 200 Internal Revenue Service employees worked . Authorities said Stack apparently had a grudge against the IRS . The remains of two people were found in the building after the crash , and 13 other people were injured -- one seriously -- authorities said . The identities of the dead were n't released as of Thursday evening . Witnesses described a scene of panic , fire and smoke . Lyric Olivarez , who was working in a nearby building , told CNN affiliate KXAN that she felt her building shake when the plane crashed . `` It sounded like an explosion , but it felt like an earthquake , '' Olivarez said . `` Someone came into our office and said there was a bomb in the building next door . We had no idea it was a plane at the time . '' When she and others ran outside , they saw the neighboring building in flames . `` People on the second and third floors were busting out windows , screaming , 'Help me ! Help me ! Get me out of here ! ' waving handkerchiefs or whatever they could find , '' Olivarez told KXAN . `` Not before long , the entire parking lot was filled with smoke , and people praying and crying , '' she said . `` I just saw smoke and flames , '' said CNN iReporter Mike Ernest . `` I could not believe what I was seeing . It was just smoke and flames everywhere . '' Dehaven said that as he was driving before the crash , he could see the plane flying low , approaching the building . `` I saw it turn and start heading down like it was diving to come in for a landing , but there 's no landing [ strip ] , '' he said . `` So I knew it was going to crash . '' He said his 6½ years in the Army , with two tours in Iraq , helped him Thursday . `` I 've had some experience in triage and battlefield , with ... gunfire , '' he said . `` My first thought [ was ] maybe I can help , because I 'm more used to dealing with traumatic situations like that . `` I have a clear head and a calm head to try to help those people , and luckily I did . ''
Army vet was driving work truck when he saw plane hit building . The crash happened at about 9:45 a.m. in the parking lot of a shopping center near Interstate 35 and Highway 59. He and other bystanders helped people out of burning building .