Prescott worked at facility where Congressional mail is screened - DC Breaking Local News Weather Sports FOX 5 WTTG

The Crofton, Md. man arrested for making a telephoned threat to his former supervisor used to work for a facility that screens mail and packages headed to the U.S. House of Representatives.

According to an employee at the Pitney Bowes facility on E. Hampton Drive in Largo, Md., the center screens mail and packages for chemical and biological contamination.

Neil Edwin Prescott has been taken into custody by police, and according to authorities, is undergoing a mental evaluation.

According to a search warrant, Prescott issued threats on Monday during two telephone calls with a former supervisor. An affidavit filed in support of a search warrant says Prescott, during one of the calls, said, "…he would like to see the supervisor's brain splatter[ed] all over the sidewalk." Investigators say he also referred to The Joker in one of the calls.

One week ago, a gunman sprayed gunfire throughout a Colorado movie theater showing the new Batman movie. The Joker is a favorite villain in Batman comic books.

A source who works for Pitney Bowes said Prescott was an IT employee for a subcontractor. Pitney Bowes, in a statement, confirmed Prescott's status as a former subcontractor. The company also said Prescott has not been on Pitney Bowes property for more than four months.

Prescott was taken into custody wearing a t-shirt which read, "Guns don't kill people, I do," according to authorities.

Police say he offered no resistance when apprehended at his the Keswick Park apartment complex in Crofton. Residents at the complex expressed relief that police in both Prince George's County and Anne Arundel County took seriously the telephoned threats.

Resident Terry Buchanan told us: "People need to learn [from] what happened in Colorado that it's not a joke. It's very serious."

An employee at the Pitney Bowes facility in Largo where Prescott worked for about three years described him as very tall and very quiet.