ACAPULCO, Mexico (AP) — A day after Hurricane Otis roared ashore in Acapulco, unleashing massive floods and setting off looting, the resort city of nearly 1 million descended into chaos, leaving residents without electricity or internet service as the toll remained uncertain.

The early images and accounts were of extensive devastation, toppled trees and power lines lying in brown floodwaters that in some areas extended for miles. The resulting destruction delayed a comprehensive response by the government, which was still assessing the damage along Mexico’s Pacific coast, and made residents desperate.

Many of the once sleek beachfront hotels in Acapulco looked like toothless, shattered hulks a day after the Category 5 storm blew out hundreds — and possibly thousands — of windows.

There seemed to be a widespread frustration with authorities. While some 10,000 military troops were deployed to the area, they lacked the tools to clean tons of mud and fallen trees from the streets. Hundreds of trucks from the government electricity company arrived in Acapulco early Wednesday, but seemed at a loss as to how to restore power, with downed electricity lines lying in feet of mud and water.

Inside one store, National Guard officers allowed looters to take perishable items like food, but made futile efforts to prevent people from taking appliances, even as people outside loaded refrigerators on top of taxis.

It took nearly all day Wednesday for authorities to partially reopen the main highway connecting Acapulco to the state capital Chilpancingo and Mexico City. The vital ground link allowed dozens of emergency vehicles, personnel and trucks carrying supplies to reach the battered port.

Acapulco’s commercial and military airports were still too badly damaged to resume flights.

Acapulco’s Diamond Zone, an oceanfront area replete with hotels, restaurants and other tourist attractions, looked to be mostly underwater in drone footage that Foro TV posted online Wednesday afternoon, with boulevards and bridges completely hidden by an enormous lake of brown water.

Large buildings had their walls and roofs partially or completely ripped off. Dislodged solar panels, cars and debris littered the lobby of one severely damaged hotel. People wandered up to their waists in water in some areas, while on other less-flooded streets soldiers shoveled rubble and fallen palm fronds from the pavement.

Wednesday night the city plunged into darkness. There was no phone service, but some people were able to use satellite phones loaned by the Red Cross to let family members know they were OK.

Alicia Galindo, a 28-year-old stylist in the central Mexican city of San Luis Potosi, was one of the lucky ones to get such a call. Her parents and brother were staying in Acapulco’s Hotel Princess for an international mining conference when Otis hit early Wednesday with 165 mph (270 kmh) winds.

They told her the worst part of the storm was between 1 am and 3 am when “windows began to fall, floors broke up, mattresses flew, hallways collapsed, doors fell down … until everything was gone,” she said in a telephone interview with The Associated Press. Fortunately, they escaped unhurt, she said.

However, Galindo had yet to hear from her boyfriend, who was attending the same conference but staying in a different hotel.

On Tuesday, Otis took many by surprise when it rapidly strengthened from a tropical storm to a powerful Category 5 as it tore along the coast.

“It’s one thing to have a Category 5 hurricane make landfall somewhere when you’re expecting it or expecting a strong hurricane, but to have it happen when you’re not expecting anything to happen is truly a nightmare,” said Brian McNoldy, a hurricane researcher at the University of Miami.

Acapulco, Tecpan and other towns along the Costa Grande in Guerrero were hit hard, Mexican President Andrés Manuel López Obrador said Wednesday morning. He said conditions were so bad that communication with the area had been “completely lost.”