At least six people have died and over 150 others injured after the most powerful earthquake that hit Albania in decades rocked the capital of Tirana and surrounding region early on Tuesday, causing several buildings to collapse and burying residents in the rubble.

The 6.4 magnitude quake struck shortly before 4 a.m. local time (0300 GMT), the U.S. Geological Survey (USGS) said, the second powerful tremor to hit the region in two months.

It was centered 30 km (19 miles) west of Tirana, at a shallow depth of 10 km (6 miles), the USGS said.

Two women were found in the rubble of an apartment building in the northern village of Thumane, and a man died in the town of Kurbin after panicking and jumping out of a building.

The bodies of three other victims were pulled from the wreckage of two collapsed buildings in Durres, the defense ministry said.

Emergency workers said one of those killed was an elderly woman who had managed to save her grandson by cradling him with her body.

Firefighters and army staff are helping residents caught under the rubble in Durres and the nearby village of Thumane,” the Defense Ministry spokeswoman told reporters.

An earthquake with a magnitude of 5.6 shook the country on Sept. 21, damaging around 500 houses and destroying some. The Defense Ministry had said it was the most powerful quake in Albania in the last 30 years. the northern town of Shkoder, bordering Montenegro. Neither of those two earlier earthquakes caused any fatalities.

The Balkan nation is the poorest country in Europe, with an average income of less than a third of the European Union average, according to Eurostat data.