Two people have died after a strong earthquake with a preliminary magnitude of at least 6.1 hit the western Greek island of Lefkada.

The quake was felt across western Greece, with people on Lefkada and the nearby Ionian Sea island of Kefalonia rushing out onto the streets.

Fire department officials said they were sending crews to Lefkada to assess the situation and help clean-up efforts.

The Athens Geodynamic Institute said the undersea quake had a preliminary magnitude of 6.1 and occurred at 7.10am off Greece's western mainland, about 186 miles west of Athens.

The fire department said an 82-year-old woman was killed in the village of Athani when a wall collapsed on her, while the regional governor's office said they had received a "credible report" of a second fatality.

The island's network of mountainous roads was damaged by landslides, with schools shut on both Lefkada and Kefalonia as a precaution.