Up to two million people have taken part in a demonstration against terror in the Spanish capital Madrid a day after bomb attacks killed nearly 200. European leaders joined the protest to show solidarity. Millions more Spaniards joined similar rallies and vigils held across the country, which remains in mourning. Officials say Basque militants from Eta remain the main suspects - but Basque media are carrying a statement, said to be from the group, denying involvement. The government says it is ruling out no line of inquiry. Some clues appear to implicate Islamic radicals. Prince, politicians and people In Madrid...