The US authorities have charged seven men with involvement in a plot to destroy the nation's tallest building, the Sears Tower in Chicago. The men were arrested at a warehouse in Miami, in an undercover operation. The FBI says the suspects, believed to be Muslims, had pledged allegiance to al-Qaeda, but had no contacts with it. The group, which was infiltrated by an agent posing as an al-Qaeda member, includes two foreigners - one of them a Haitian - and five US citizens. "They were persons who for whatever reason came to view their home country as the enemy," US...