Deputies escorted some Kaufman County employees into the courthouse Monday, two days after the district attorney and his wife were found shot to death in their home in an attack that stirred fears that other public employees could be targeted by assassins.
Law enforcement officers were seen patrolling one side of the courthouse, one holding a semi-automatic weapon, while others walked around inside.
Authorities have said little about the investigation into the deaths of Kaufman County District Attorney Mike McLelland and his wife, whose bodies were found Saturday.
Documents in the slayings of a Texas district attorney and his wife indicate that the couple had been shot multiple times when they were found dead in their home.
A search warrant affidavit says deputies were called to the home Saturday by relatives and friends who'd been unable to reach McLelland and his wife, Cynthia.
Authorities found cartridge casings near their bodies.
The couple's slayings came less than two weeks after Colorado's prison chief was shot to death at his front door, apparently by an ex-convict, and a couple of months after Kaufman County Assistant District Attorney Mark Hasse was killed in a parking lot near his courthouse office. No arrests have been made in Hasse's Jan. 31 killing.
"I don't want to walk around in fear every day ... but on the other hand, two months ago, we wouldn't be having this conversation," County Judge Bruce Wood, the county's top administrator, said Monday at a news conference.
Law enforcement agencies throughout Texas were on high alert, and steps were being taken to better protect other DAs and their staffs.
Gov. Rick Perry is suggesting that everyone -- but especially public officials -- should be extra cautious after the weekend killings.
Asked Monday if public officials should fear for their safety, Perry said: "I would suggest everyone should be careful about what goes on whether they're public officials or otherwise."
Perry added that he believes there is "a clear concern to individuals who are in public life, particularly those who deal with some very mean and vicious individuals" including white supremacy group and drug gangs.
But the governor said he had no personal knowledge of the investigation.
McLelland, 63, was the 13th prosecutor killed in the U.S. since the National Association of District Attorneys began keeping count in the 1960s.
Kaufman County Sheriff David Byrnes would not give details Sunday of how the killings unfolded and said there was nothing to indicate for certain whether the DA's slaying was connected to Hasse's.