At least four people were killed Friday in an explosion that destroyed much of the Hotel Saratoga, a luxury hotel in the historic center of Havana, Cuban authorities said. The Communist Party’s First Secretary in Havana, Luis Antonio Torres Iríbar, told reporters that at least four people were dead, the Party’s newspaper Granma reported. Another Cuban official reported another 15 people were injured and receiving medical attention. Images and videos show extensive damage to several floors, but the building was still standing. Two floors lost walls and windows, and a store on the ground floor w…