Rebels set their sights on the rest of Haiti on Monday after swooping in to take the country’s second-largest city in an escalation of a bloody rebellion against President Jean-Bertrand Aristide, prompting the US to send in Marines to protect its embassy. With the rebels now in control of Cap Haitien and determined to move on, Washington was sending about 50 US Marines to to protect its embassy in Port-au-Prince, a US official said on Monday. France, the former colonial power, joined several other foreign governments and told its citizens to leave the country, wracked by violence that has killed more than 50 people since the revolt began on February 5.