Venezuela was just rocked by back-to-back earthquakes. Here’s what we know

(CNN) — Venezuela’s northern coast was hit by two powerful earthquakes within a minute of each other on Wednesday, collapsing buildings and sending residents fleeing onto the street.

The US Geological Survey (USGS) warned that the successive quakes could cause thousands of casualties and widespread damage, though the extent of their impact is not yet clear. A state of emergency has been declared, as first responders and security forces deploy nationwide.

This comes at a dire time for Venezuela, which is still deep in political and financial crisis – being led by an interim government after US forces captured President Nicolás Maduro earlier this year, and facing an economy crippled by years of hyperinflation.

Here’s what we know so far.

What happened?

A magnitude 7.2 foreshock took place near San Felipe, the capital city of Yaracuy state, just after 6:04 p.m. ET.

Just 40 seconds later, it was followed by a larger 7.5 magnitude quake, some 23 kilometers (about 14 miles) southeast of Yumare – a town also in Yaracuy state, home to some of the country’s largest oil refineries.

Wednesday was a public holiday, celebrating St. John the Baptist as well as commemorating the country’s independence from Spain – meaning many people may have been home or at public events.

The quake was strong enough to be felt in states across the country – as well as in neighboring Colombia, hundreds of kilometers from the epicenter.

In the capital Caracas, about 300 kilometers (186 miles) from the quake’s epicenter, at least three buildings partially collapsed in the wealthy eastern neighborhoods near Altamira Square.

Multiple videos geolocated by CNN show extensive damage to buildings and infrastructure across Venezuela, including in Caracas and the coastal town of Catia La Mar, where several collapsed buildings can be seen on a hillside.

Terrified residents were seen evacuating buildings with their loved ones and pets before gathering on the street. One Caracas resident who escaped from a damaged building said “the scene was like a horror movie.”

There is no ongoing tsunami threat, according to the US Tsunami Warning Centers, which canceled its previous tsunami warning for Puerto Rico, the Virgin Islands, and coasts within 300 kilometers of the epicenter.

What’s the damage so far?

Acting President Delcy Rodríguez, who stepped into the role after Maduro’s capture, confirmed there were fatalities and expressed condolences to victims’ families in a national address Wednesday night – but did not say how many had died.

The USGS issued two separate red alerts through its PAGER system for the back-to-back quakes – indicating how serious the disaster may be. Historically, the USGS only issues such alerts once or twice a year.

“Red alert for shaking-related fatalities and economic losses. High casualties and extensive damage are probable and the disaster is likely widespread. Past red alerts have required a national or international response,” said the USGS alert.

Most people in the region live in structures vulnerable to the quake’s shaking, it added.

What’s the response?

Venezuela has declared a state of emergency, with a high-level task force created to oversee search and rescue operations, Rodriguez said in her address.

Simon Bolivar Airport near Caracas has temporarily closed after suffering damage, she added. School classes will be suspended nationwide for a week, and rail services and non-essential activities have also been temporarily canceled.

Security forces have been deployed across Venezuela, given the risk of “many structures” collapsing, according to the Ministry of Communication and Information.

The government has also authorized the shut-off of direct gas supplies to certain buildings “as a preventative measure” while authorities assess damaged structures, the ministry said.

Rodriguez said multiple states have been affected, with some areas reporting power failures. Internet connectivity dropped sharply across Venezuela after the quakes damaged power and telecommunications infrastructure, according to watchdog NetBlocks.

Messages of solidarity and condolences poured in from Latin American governments throughout Wednesday evening, including Mexico, El Salvador, Brazil, Bolivia and more.

This is a developing story and will be updated.

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CNN’s Stefano Pozzebon, Avery Schmitz, Thomas Bordeaux, Ivonne Valdes and Camille Rodriguez contributed to this report.