KEY WEST, Fla. (AP) — “Extremely dangerous” Hurricane Ike grew to fierce Category 4 strength Saturday as it roared on an uncertain path that forced millions from the Caribbean to Florida, and Louisiana to Mexico, to nervously wonder where it would eventually strike.

Preparations stretched more than 1,000 miles as the massive, 135-mph storm took a southwesterly shift that could send it over Cuba and the Florida Keys by Tuesday before heading into the warm open waters of the Gulf of Mexico. And once again, a possible target was New Orleans and the already storm-weary U.S. Gulf Coast.

“These storms have a mind of their own,” Florida Gov. Charlie Crist said after a meeting with mayors and emergency officials. “There are no rules, so what we have to do is be prepared, be smart, vigilant and alert.”

First in Ike’s path was the low-lying British territory of Turks and Caicos, already pummeled for four days this week by Tropical Storm Hanna. At the airport in Providenciales, Patrick Munroe had hoped to catch a departing flight, but was turned away, even before the airport shuttered.

“It looks really, really serious,” he said. “And I think it’s going to be devastating.”

In Haiti, authorities tried to move thousands of people into shelters ahead of Ike, still struggling to recover from Tropical Storm Hanna. Rescue workers feared Hanna’s death toll could rise into the hundreds in the flooded city of Gonaives and that aid efforts could be further impeded as Ike approached.

Hanna did not pack the same punch Saturday while racing up the U.S. Eastern seaboard, but it did cause one death in a traffic accident on Interstate 95 in Maryland. It also brought fits of wind and pelting rain all along its trek toward New England.

But Ike is another matter.

Tens of millions of people in countries spread over a swath of the hurricane zone monitored the trajectory of a storm that had a huge footprint, with tropical storm-force winds stretching up to 140 miles from its eye.

At 7 p.m. EDT, Ike’s center was located about 60 miles east of Grand Turk Island as the storm moved west-southwest at about 15 mph, the National Hurricane Center in Miami said.

The center said Ike was an “extremely dangerous” Category 4 storm with sustained winds of about 135 mph and gusts even higher. It said the core of Ike was expected to shortly pass “near or over” the Turks and Caicos and begin to affect the southeastern Bahamas overnight.

Tourists were urged to leave the Bahamas, and authorities in the Dominican Republic began evacuating dozens of families from river banks that could flood with waters from two already overfilled dams.

In Cuba, the island’s top meteorologist warned Ike was a “true danger” and government officials began the early phases of emergency preparations. But no alarm was evident in Havana, where the U.S. soccer team was set to play Cuba in a World Cup qualifying match.

In Louisiana, still recovering from last week’s Hurricane Gustav, Gov. Bobby Jindal set up a task force to prepare for the possibility of more havoc.

“We’re not hoping for another strike, another storm, but we’re ready,” he said.