Hancock added that the Capitol Police and the State Highway patrol had been notified about the incident.
Follow his Twitter account for the latest developments.
Update: Here's what State Senator Maria Chappelle-Nadal had to say about it:
Update X2: The Columbia Tribune has a full story about it. An excerpt:
Orange stickers with an image of rifle crosshairs were found Tuesday on the office doors of several Democratic state Senators, prompting an investigation by the Capitol Police Department, Senate Administrator Jim Howerton said.
“We are taking all the precautions we can,” Howerton said.
The stickers were on the doors of all four Democratic women in the Senate — Jolie Justus and Kiki Curls, both of Kansas City, and Maria Chapelle-Nadal and Robin Wright-Jones, both of St. Louis, Justus said.
“If anyone thinks this was a prank, it is not a prank,” Justus said after discussing the discovery of the stickers on the Senate floor. “You don’t joke about someone’s personal safety.”
A sticker also was found on the door of Sen. Victor Callahan, D-Kansas City and the Democrats’ floor leader.
Update X3: Here's a photo of one of the stickers on a Senator's nameplate, courtesy of reporter Sherman Fabes: