NASA gunman kills hostage, self

An armed man kills a hostage before killing himself at NASA's Johnson Space Center, television station KTRK of Houston reports.

An armed man shot and killed a hostage, then himself in an incident at NASA's Johnson Space Center, television station KTRK of Houston reported on Friday.

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Another hostage escaped, the station said, citing unnamed sources.

Houston police are expected to hold a news conference shortly on the events.