KAUFMAN, Texas (AP) – An assistant district attorney was shot and killed Thursday morning near the North Texas courthouse where he worked, and authorities said they were searching through his cases to try to find clues about why he may have been targeted.

Mark Hasse, 57, had exited his vehicle in the parking lot behind the Kaufman County Courthouse annex and was walking toward the building when a masked gunman shot him multiple times just before 9 a.m., Kaufman County authorities said. Hasse was taken away in an ambulance, but it’s unclear if he died at the hospital or en route.

Investigators were talking to witnesses and had some leads but had not arrested anyone as of Thursday afternoon, Kaufman Police Chief Chris Aulbaugh said. He urged the public to come forward with tips. The suspect or suspects were believed to have fled in a brown or silver older model Ford Taurus. Officials didn’t immediately indicate any motive for the shooting in Kaufman, located about 33 miles southeast of Dallas.