Uncertainty is gripping world financial markets after elections in Greece and France raised concerns about the future of austerity measures to help rescue Europe's debt-ridden governments and its ailing economies. Key Asian markets fell sharply yesterday with Japan's Nikkei index closing down 2.8 percent and Hong Kong's Hang Seng off 2.6 percent. The Athens stock exchange plunged nearly 7 percent after the vote in Greek national elections left immediate formation of a new government in doubt.U.S. stocks traded in a narrow range, largely unchanged from Friday's close. After initially falling, both the Paris and Frankfurt markets ended up for the day. The value of the euro dipped below 1.30 dollars before regaining some strength.In France, voters elected Socialist Francois Hollande as president. He has pledged to push back against German-led austerity programmes and called for higher taxes on the wealthy and measures to boost economic growth.