Quito: Ecuador's vice-president says the toll in the country's devastating earthquake has risen to 77 dead and 578 injured.
Vice-President Jorge Glas made the announcement early Sunday on the Security Ministry's Twitter account.
Glas and emergency rescue workers are pressing to reach the sparsely populated area of fishing ports and tourist beaches along the country's Pacific coast where the magnitude-7.8 quake struck after nightfall on Saturday.
A powerful, 7.8-magnitude earthquake shook Ecuador's central coast on Saturday, killing at least 41 people and spreading panic hundreds of kilometres (miles) away as it collapsed homes and buckled a major overpass.
The US Geological Survey said the shallow quake, the strongest since 1979 to hit Ecuador, was centred 27 kilometres (16 miles) south-southeast of Muisne, a sparsely populated area of fishing ports that's popular with tourists.
"We're trying to do the most we can but there's almost nothing we can do," said Gabriel Alcivar, mayor of Pedernales, a town of 40,000 near the epicentre. He pleaded for rescuers as dozens of buildings in the town were flattened, people trapped and looting broke out amid the chaos. "This wasn't just a house that collapsed, it was an entire town."
Among those killed was the driver of a car crushed by an overpass that buckled in Guayaquil, the country's most populous city.
On social media residents shared photos of homes collapsed, the roof of a shopping centre coming apart and supermarket shelves shaking violently. In Manta, the airport was closed after the control tower collapsed, injuring an air force official. Hydroelectric dams and oil pipelines in the OPEC-member nation were shut down as a precautionary measure.
President Rafael Correa, who is in Rome after attending a Vatican conference Friday, called on Ecuadoreans to stay strong while authorities monitor events.
He said on Twitter he had signed a decree declaring a national emergency but that the earliest he could get back to Ecuador is Sunday afternoon. He said that there were "dozens of dead" from the earthquake.
The Pacific Tsunami Warning Centre said hazardous tsunami waves are possible for some coasts. While the government hadn't issued a tsunami alert, Glas urged residents along the coast to move to higher ground and towns near the epicentre were also being evacuated as a precautionary measure. An emergency had been declared in six of Ecuador's 24 provinces, while sporting events and concerts were cancelled until further notice nationwide.
"It's very important that Ecuadoreans remain calm during this emergency," Glas said from Ecuador's national crisis room.
The quake was felt across the border in Colombia, where it shook residents in Cali and Popayan, and Peru briefly issued a tsunami warning.
In the capital Quito hundreds of kilometres away from the epicentre, the quake was felt for about 40 seconds and people fled to the streets in fear. The quake knocked out electricity in several neighborhoods and six homes collapsed but the situation under control and power being restored, Quito's Mayor Mauricio Rodas said.
"I'm in a state of panic," said Zoila Villena, one of many Quito residents who congregated in the streets. "My building moved a lot and things fell to the floor. Lots of neighbors were screaming and kids crying."
The USGS originally put the quake at a magnitude of 7.4 then raised it to 7.8. It had a depth of 19 kilometres. At least 36 aftershocks followed, one as strong as 6 on the Richter scale, and authorities urged residents to brace for even stronger ones in the coming hours and days.
Guayaquil's international airport was also closed because of a lack of communications.
The quake comes on the heels of two deadly earthquakes across the Pacific, in the southernmost of Japan's four main islands. A magnitude-6.5 earthquake struck Thursday near Kumamoto, followed by a magnitude-7.3 earthquake just 28 hours later. The quakes have killed 41 people and injured about 1,500, flattened houses and triggered major landslides.