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By Baz Ratner and Manuel Mogato EIN ZIVAN Golan Heights/MANILA (Reuters) - Heavy fighting erupted on Monday between the Syrian army and Islamist rebels on the Golan Heights, where 44 peacekeepers from Fiji are being held by militants and scores of their fellow blue helmets from the Philippines escaped after resisting capture. Syria's three-year civil war reached the frontier with Israeli-controlled territory last week when Islamist fighters overran a crossing point in the line that has separated Israelis from Syrians in the Golan Heights since a 1973 war. The fighters also turned against the U.N. blue helmets from a peacekeeping force that has patrolled the ceasefire line for 40 years. The United Nations says it is not sure where they are being held.