Yemeni officials say heavy fighting has broken out in the capital Sanaa between security forces and an army unit that joined the popular uprising against autocratic President Ali Abdullah Saleh.

An official from Mr. Saleh’s military says one man from each side had been killed in the Friday fighting. He spoke on condition of anonymity because he was not authorised to brief the media.

The clashes pit Central Security forces under the command of Mr. Saleh’s nephew against the army’s First Armoured Division, led by a general who defected to the opposition in March.

The fighting follows Mr. Saleh’s signing of a U.S.-backed deal to end his 33-year rule in exchange for immunity from prosecution. Many protesters reject the deal and demand that Mr. Saleh stand trial.

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