Intruders, apparently drunk, broke into the Orsay Museum through a back door early on Sunday and punched a hole in a renowned work by Impressionist painter Claude Monet, the French culture minister said.A surveillance camera caught a group of four to five people entering the museum, which houses a major collection of Impressionist art on the Left Bank of the French capital along the Seine River.An alarm sounded, and the group left, but not before damaging an invaluable painting, Le Pont d'Argenteuil, Culture Minister Christine Albanel said."We know there were four or five people, likely four boys and a girl, who entered around midnight to 1 am, broke a door that was, perhaps, fragile," Albanel said. "It appears they were drunk. ... Someone punched the magnificent masterpiece by Monet."No arrests were immediately made and there were no signs the group was armed, Albanel told reporters at a news conference. Albanel said the painting could be restored, but she deplored the damage.