BREAKING NEWS - Gustav swelled into a fearsome Category 4 hurricane with winds of 145 mph on Saturday as Cuba raced to evacuate more than 240,000 people and Americans to the north clogged highways fleeing New Orleans. It could become a Category 5 storm over the Gulf of Mexico by Sunday, with winds of 160 mph (255 kph) according to the U.S. National Hurricane Center in Miami. Gustav already has killed 81 people in the Caribbean and it was on a course for the Katrina-battered U.S. coast. Cuba grounded all national airline fights, though planes bound for international destinations were still taking off at Havana's Jose Marti International Airport. The government's AIN news agency said officials were evacuating some 190,000 people from low-lying parts of tobacco-rich Pinar del Rio province on the western tip of Cuba's main island. AIN reported that 50,000 already had been evacuated further east.