Gunman Opens Fire at NASA

A man with a gun entered a building on the sprawling campus of Johnson Space Center Friday, forcing the evacuation of the building and putting the entire center on alert.

A witness reported two shots fired, said Houston Police spokesman Capt. Dwayne Ready, who described the suspect as a white man with blond hair, about 5 feet 9 inches and 50 to 60 years old. He is armed with a handgun.

"He's barricaded himself into a room," Ready said. "We're not going to know anything more until we establish communication."

Ready could not confirm whether there were any hostages or injuries.

The gunman is in building 44 on the Johnson Space Center property, police said. Building 44 holds a laboratory.