An earthquake with a magnitude of 6.3, at a depth of approximately 10km, has struck off the coast of western Turkey. Effects of the quake have been felt in the cities of Izmir and as far away as Athens in Greece, according to the European Earthquake monitor, EMSC.

Witnesses said they felt a strong quake as “everyone ran outside,” with one describing it as the biggest they ever felt in Turkey.

A woman on the island of Lesbos was killed after the roof of her home collapsed during the quake.

Other earthquake monitoring agencies issued preliminary reports of a tremor of varying magnitude, with the USGS alerting a 6.3 and the Greek Geodynamics Institute posting a 6.1 quake.

Just had an earthquake in Izmir. Biggest I've felt in Turkey. Pretty scary. Everyone ran outside. — James Lloyd (@j_jlloyd) June 12, 2017

Deprem anımız bendeki rahatlığa bak A post shared by fuat çifci (@fuattttttt) on Jun 12, 2017 at 5:47am PDT

The quake was felt as far away as Plovdiv in central Bulgaria.

Several aftershocks have been reported since the initial quake, measuring between 3.0 and 4.9.

I felt it here in Plovdiv Bulgaria. Really felt it. Then saw a speaker moving back and forth and my water jug. First earthquake I've felt. — Todd Dosenberry (@atravelingtoad) June 12, 2017

“Canakkale is swaying!” a video uploaded from the northwestern city in Turkey said, showing commotion on the streets following the quake.

An itibariyla Canakkale fena sallandi!!! #instaturkey#deprem#canakkale#gununkaresi A post shared by Ulash (@ulashkya) on Jun 12, 2017 at 5:31am PDT

The quake was also felt on the Greek island of Lesbos, where small landslides and damage were reported by ERT. No injuries have been reported.

#deprem #ege #manisa #evimiz #akvaryum #earthquake #myhome #fishtank #aquarium A post shared by Gökhan Altıntaş (@gokhan__altintas) on Jun 12, 2017 at 5:46am PDT