Kaufman County, Tx (CNN) — Investigators on Friday were reviewing the cases that a Texas prosecutor was handling for possible clues about what led to his killing.
Mark Hasse, assistant district attorney in Kaufman County, Texas, was gunned down Thursday morning in the county courthouse parking lot.
There were no significant advances in the case, Kaufman Police Chief Chris Aulbaugh said Friday, but that doesn't mean investigators aren't busy.
"We've fielded numerous tips coming in from the public, we are following up on every one of them," he said.
Police say they believe one or two people committed the crime, but there are few descriptive details because they hid their faces. Police are looking for a gray or silver older model sedan in relation to the case, Aulbaugh said.
Hasse was shot several times after "a very small, very short confrontation," police said.
Investigators are looking into whether Hasse's killing was retribution for any of the prosecutions he led. Hasse was one of 13 prosecuting attorneys in Kaufman County, each of whom handled between 380 and 390 cases.
Authorities hope than an ever-growing reward for information will reveal more leads.
Donors in area have raised $64,500 to be used as reward money, and the police chief has asked for more donations.
The Texas Rangers, the FBI and agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives have joined the manhunt.