The Paris Olympics were getting off to a rougher than hoped-for start Friday, with suspected acts of sabotage targeting France's flagship high-speed rail network and cloudy skies with light drizzle over the French capital ahead of its sprawling, ambitious opening ceremony.

On a day of utmost importance for France and its capital, with dozens of heads of state and government in town for the Olympic opening and a global audience of over 1 billion expected to tune in, authorities were scrambling to deal with widespread rail disruptions caused by what they described as coordinated overnight sabotage of high-speed train lines.