NEW YORK (Reuters) - An author whose account of the World Trade Center clean-up included allegations that firefighters looted from the Twin Towers was met with angry protests on Monday night during his book tour. About 100 firefighters and other protesters gathered outside a museum in lower Manhattan, where journalist William Langewiesche read from his book, "American Ground: Unbuilding the World Trade Center." During months of recovery and clean-up after the Sept. 11 attacks, Langewiesche had unrestricted access to the site, known as Ground Zero. Hundreds of firefighters were among the nearly 3,000 victims of the trade center attacks. They...