BANGKOK (AP) — A powerful earthquake rocked Myanmar and neighboring Thailand on Friday, destroying buildings, a bridge and a dam. At least 144 people were killed in Myanmar, where photos and video from two hard-hit cities showed extensive damage. At least eight died in the Thai capital, where a high-rise under construction collapsed.

The 7.7 magnitude quake, with an epicenter near Mandalay, Myanmar‘s second largest city, struck at midday and was followed by a strong 6.4 magnitude aftershock.

The full extent of death, injury and destruction was not immediately clear — particularly in Myanmar, one of the world’s poorest countries. It is embroiled in a civil war and information is tightly controlled.

The head of Myanmar’s military government said in the televised speech on Friday evening that at least 144 people were killed and 730 others were injured.

“The death toll and injuries are expected to rise,” Senior Gen. Min Aung Hlaing said.

Photos from the capital of Naypyidaw showed multiple buildings used to house civil servants destroyed by the quake, and rescue crews pulling victims from the rubble.

Myanmar’s government said blood was in high demand in the hardest-hit areas. Images of buckled and cracked roads in Mandalay and damaged highways as well as the collapse of a bridge and dam raised further concerns about how rescuers would even reach some areas in a country already enduring a widespread humanitarian crisis.

Near Bangkok’s popular Chatuchak market, a 33-story building under construction, with a crane on top, crumpled into a cloud of dust, and onlookers could be seen screaming and running in a video posted on social media.

The sound of sirens echoed throughout central Bangkok and vehicles filled the streets, leaving some of the city’s already congested streets gridlocked. The elevated rapid transit system and subway shut down.

While the area where the quake struck is prone to earthquakes, they are usually not so big and it is rare for them to be felt in the Thai capital, which sits on a river delta and is at moderate risk for quakes.

April Kanichawanakul, who works in an office building in Bangkok, initially didn’t even realize it was an earthquake, the first she’d ever experienced. “I just thought I was dizzy,” she said.

She and her colleagues ran downstairs from the 10th floor of their building and waited outside for a signal that it was safe to go back in.

Crane-topped building collapsed in a cloud of dust

In Bangkok, at least three people were killed in the building collapse and 90 were missing, according to Defense Minister Phumtham Wechayachai. He offered no more details about the ongoing rescue efforts but first responders said that seven people had been rescued so far from the area.

At least two of the dead were construction workers who were killed by falling rubble or debris, rescue worker Songwut Wangpon told reporters. The building was being built by the China Railway Construction Corporation for Thailand’s government auditor general.

Elsewhere, people in Bangkok evacuated from their buildings were cautioned to stay outside in case there were more aftershocks.

The U.S. Geological Survey and Germany’s GFZ center for geosciences said the earthquake was a shallow 10 kilometers (6.2 miles), according to preliminary reports. Shallower earthquakes tend to cause more damage.

Screaming and panic as buildings swayed

Bangkok’s city hall declared the city a disaster area to facilitate the response. The greater metropolitan area is home to more than 17 million people, many of whom live in high-rise apartments.

“All of a sudden the whole building began to move. Immediately there was screaming and a lot of panic,” said Fraser Morton, a tourist from Scotland, who was in one of Bangkok’s many malls.

“I just started walking calmly at first but then the building started really moving, yeah, a lot of screaming, a lot of panic, people running the wrong way down the escalators.”

Like Morton, thousands of people poured into Benjasiri Park from nearby shopping malls, high rises and apartment buildings along Bangkok’s busy Sukhumvit Road.

Many were on phones trying to reach loved ones as others sought shade from the hot early afternoon sun.

Voranoot Thirawat, a lawyer working in central Bangkok, said her first indication that something was wrong came when she saw a light swinging back and forth. Then she heard the building creaking as it moved back and forth.

She and her colleagues ran down 12 flights of stairs. “In my lifetime, there was no earthquake like this in Bangkok,” she said.