Security measures at

Lockheed-Martin Pike County Operations remain unchanged in the wake of a shooting at Lockheed's plant near Meridian, Miss.

Tuesday, Lauderdale County, Miss. authorities identified the gunman as Doug Williams, who was an assembler at the plant. He killed six, including

two Alabama residents who worked in Meridian, and injured 13 others.

"Our thoughts and prayers are with our employees and their families during this trying time.

This was a senseless act of violence," said Meghan Mariman, a spokesman for Lockheed. "The safety and welfare of our employees is Lockheed Martin's highest priority.

Our people are our most valuable asset."

Mariman said the Mississippi plant was a minimum-security plant because the type of subassembly work done there was not of a classified nature.

She said that security at Pike County Operations was much tighter, reducing the likelihood of a similar occurrence here.

Lockheed Martin is headquartered in Bethesda, Md., and employs about 125,000 people worldwide. The Mississippi facility employs about 100.