Saudi troops surround home in capital

Saudi security forces have surrounded a house in central Riyadh.

Officials say they believe militants are holed up in the house after an exchange of gunfire at a traffic light.

Police cars and armored vehicles as well as other emergency forces have filled the area.

It's near where security forces killed accused al-Qaida leader Abdulaziz al-Moqrin Friday night. His group claims responsibility for killing American hostage Paul Johnson.

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