TACLOBAN, Philippines — The central Philippine city of Tacloban was in ruins Saturday, a day after being ravaged by one of the strongest typhoons on record, as horrified residents spoke of storm surges as high as trees and authorities said they were expecting a “very high number of fatalities.”

At least 138 people were confirmed dead in the aftermath of Typhoon Haiyan. But Philippine Red Cross Secretary General Gwen Pang said that agency field staff in the region estimated the toll was about 1,000. Pang, however, emphasized that it was “just an estimate.”

The typhoon slammed into six central Philippine islands on Friday, wiping away buildings and leveling seaside homes. At least 118 of the confirmed deaths were on hardest-hit Leyte Island, where Tacloban is located, said national disaster agency spokesman Maj. Reynaldo Balido.

But after arriving in Tacloban on Saturday, Interior Secretary Mar Roxas said it was too early to know how many people had died in the storm, which was heading toward Vietnam after moving away from the Philippines.

“The rescue operation is ongoing. We expect a very high number of fatalities as well as injured,” Roxas said. “All systems, all vestiges of modern living — communications, power, water — all are down. Media is down, so there is no way to communicate with the people in a mass sort of way.”

President Benigno Aquino III said the casualties “will be substantially more,” but gave no figure or estimate. He said the government’s priority was to restore power and communications in isolated areas to allow for the delivery of relief and medical assistance to victims.

The Philippine Red Cross and its partners were preparing for a major relief effort “because of the magnitude of the disaster,” said the agency’s chairman, Richard Gordon.

The airport in Tacloban, a city of 200,000 located about 580 kilometers (360 miles) southeast of Manila, looked like a muddy wasteland of debris Saturday, with crumpled tin roofs and upturned cars. The airport tower’s glass windows were shattered, and air force helicopters were busy flying in and out at the start of relief operations.

“The devastation is, I don’t have the words for it,” Roxas said. “It’s really horrific. It’s a great human tragedy.”

Defense Secretary Voltaire Gazmin said Aquino was “speechless” when he told him of the devastation the typhoon had wrought in Tacloban.

“I told him all systems are down,” Gazmin said. “There is no power, no water, nothing. People are desperate. They’re looting.”

U.S. Marine Col. Mike Wylie surveyed the damage in Tacloban prior to possible American assistance. “The storm surge came in fairly high and there is significant structural damage and trees blown over,” said Wylie, who is a member of the U.S.-Philippines Military Assistance Group based in Manila.

U.S. Secretary of State John Kerry said in a statement that America “stands ready to help.”

Tacloban is near the Red Beach on Leyte Island where U.S. Gen. Douglas MacArthur waded ashore on October 20, 1944, fulfilling his famous pledge, “I shall return,” made in March 1942 after President Franklin D. Roosevelt ordered him to relocate to Australia as Japanese forces pushed back U.S. and Filipino defenders.