BEIRUT, May 7 (Reuters) - Rival gunmen exchanged fire in at least three districts of Beirut on Wednesday as Hezbollah supporters paralysed the Lebanese capital by blocking roads with burning barricades.

Security sources said pro-government supporters exchanged rifle and grenade fire with Hezbollah sympathisers in the Noueiri, Ras al Nabae and Wata al-Musaitbeh neighbourhoods. There was no immediate word of casualties but ambulances could be seen rushing to the scene. (Writing by Nadim Ladki)

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