Gunman kills hostage at Nasa base

A gunman has killed a hostage and himself during a stand-off at Nasa's Johnson Space Center in Houston, Texas.

Police, who had surrounded the scene and entered when they heard a gunshot, also found a second hostage, a woman, who was alive but tied up with tape.

Police Capt Dwayne Ready said officers were called to the scene at about 1340 (1840 GMT) after a man was seen with a gun and two shots heard.

The gunman was not identified but was reported to be an employee at the site.

He was described as a white male aged between 50 and 60.

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