A powerful magnitude 7.2 earthquake struck southwestern Haiti on Saturday, killing at least 304 people and injuring at least 1,800 others as buildings tumbled into rubble. Prime Minister Ariel Henry said he was rushing aid to areas where towns were destroyed and hospitals overwhelmed with incoming patients.

The epicenter of the quake was about 125 kilometers (78 miles) west of the capital of Port-au-Prince, the U.S. Geological Survey said, and widespread damage was reported in the hemisphere’s poorest nations as a tropical storm also bore down.

Haiti’s civil protection agency said on Twitter that the death toll stood at 304, most in the country’s south. Rescue workers and bystanders were able to pull many people to safety from the rubble. The agency said injured people were still being delivered to hospitals.

Henry declared a one-month state of emergency for the whole country and said he would not ask for international help until the extent of the damages was known. He said some towns were almost completely razed and the government had people in the coastal town of Les Cayes to help plan and coordinate the response.

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“The most important thing is to recover as many survivors as possible under the rubble,” said Henry. “We have learned that the local hospitals, in particular that of Les Cayes, are overwhelmed with wounded, fractured people.”

He said the International Red Cross and hospitals in unaffected areas were helping to care for the injured, and appealed to Haitians for unity.

“The needs are enormous. We must take care of the injured and fractured, but also provide food, aid, temporary shelter and psychological support,” he said.

Later, as he boarded a plane bound for Les Cayes, Henry said he wanted “structured solidarity” to ensure the response was coordinated to avoid the confusion that followed the devastating 2010 earthquake, when aid was slow to reach residents after as many as 300,000 were killed.

U.S. President Joe Biden authorized an immediate response and named USAID Administrator Samantha Power as the senior official coordinating the U.S effort to help Haiti. USAID will help to assess damage and assist in rebuilding, said Biden, who called the United States a “close and enduring friend to the people of Haiti.”

A growing number of countries offered help, including Argentina and Chile, which said it was preparing to send humanitarian aid. ″Once again, Haiti has been hit by adversity,″ Chilean President Sebastian Piñera said.

Among those killed in the earthquake was Gabriel Fortuné, a longtime lawmaker and former mayor of Les Cayes. He died along with several others when his hotel, Le Manguier, collapsed, the Haitian newspaper Le Nouvelliste reported.

Philippe Boutin, 37, who lives in Puerto Rico but visits his family annually in Les Cayes, said his mother was saying morning prayers when the shaking began, but was able to leave the house.

The earthquake, he said, coincided with the festivities to celebrate the town’s patron saint, adding that the hotel likely was full and the small town had more people than usual.

“We still don’t know how many people are under the rubble,” he said.

On the tiny island of Ile-a-Vache, about 6.5 miles (10.5 kilometers) from Les Cayes, the quake damaged a seaside resort popular with Haitian officials, business leaders, diplomats and humanitarian workers. Fernand Sajous, owner of the Abaka Bay Resort, said by telephone that nine of the hotel’s 30 rooms collapsed, but he said they were vacant at the time and no one was injured.

“They disappeared — just like that,” Sajous said.

People in Les Cayes tried to pull guests from the rubble of a collapsed hotel, but as the sun set, they had only been able to recover the body of a 7-year-old girl whose home was behind the facility.

“I have eight kids, and I was looking for the last one,” Jean-Claude Daniel said through tears. “I will never see her again alive. The earthquake destroyed my life. It took a child away from me.”

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The reports of overwhelmed hospitals come as Haiti struggles with the pandemic and a lack of resources to deal with it. Just last month, the country of 11 million people received its first batch of U.S.-donated coronavirus vaccines, via a United Nations program for low-income countries.

Richard Hervé Fourcand, a former Haitian senator, rented a private plane to move injured people from Les Cayes to Port-au-Prince for medical assistance. He told The Associated Press that Les Cayes’ hospital was at capacity.

The earthquake also struck just over a month after President Jovenel Moïse was killed, sending the country into political chaos. His widow, Martine Moïse, posted a message on Twitter calling for unity among Haitians: “Let’s put our shoulders together to bring solidarity.”

Rescue efforts were hampered by a landslide triggered by the quake that blocked a major road connecting the hard-hit towns of Jeremie and Les Cayes, according to Haiti’s civil protection agency.

Agency director Jerry Chandler told reporters that a partial count of structural damage included at least 860 destroyed homes and more than 700 damaged. Hospitals, schools, offices and churches were also affected.

The National Hurricane Center has forecast that Tropical Storm Grace will reach Haiti late Monday or early Tuesday.

“This is likely to make matters worse since the country is on the verge of suffering the effects of two disasters in quick succession, a magnitude 7 earthquake and a looming storm,” Chandler said.

Humanitarian workers said gang activity in the seaside district of Martissant, just west of the Haitian capital, also was complicating relief efforts.

“Nobody can travel through the area,” Ndiaga Seck, a UNICEF spokesman in Port-au-Prince, said by phone. “We can only fly over or take another route.”

Seck said information about deaths and damage was slow coming to Port-au-Prince because of spotty internet service, but UNICEF planned to send medical supplies to two hospitals in the south, in Les Cayes and Jeremie.

People in Port-au-Prince felt the tremor and many rushed into the streets in fear, although there did not appear to be damage there.

Naomi Verneus, a 34-year-old resident of Port-au-Prince, said she was jolted awake by the earthquake and that her bed was shaking.

“I woke up and didn’t have time to put my shoes on. We lived the 2010 earthquake and all I could do was run. I later remembered my two kids and my mother were still inside. My neighbor went in and told them to get out. We ran to the street,” Verneus said.

Paul Caruso, a geophysicist with the USGS, said aftershocks likely would continue for weeks or months, with the largest so far registering magnitude 5.2.

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The impoverished country, where many live in tenuous circumstances, is vulnerable to earthquakes and hurricanes. It was struck by a magnitude 5.9 earthquake in 2018 that killed more than a dozen people, and a vastly larger magnitude 7.1 quake that damaged much of the capital in 2010 and killed an estimated 300,000 people.

By Saturday night, the island had experienced four aftershocks stronger than 5.0 and nine above 4.0.

Claude Prepetit, a Haitian civil engineer and geologist, warned of the danger from cracked structures.

“More or less intensive aftershocks are to be expected for a month,” he said, cautioning that some buildings, “badly damaged during the earthquake, can collapse during aftershocks..”