ISTANBUL — A magnitude 6.1 earthquake struck Turkey's northwestern province of Balikesir on Sunday, causing about a dozen buildings to collapse, an official said. At least two people were trapped in the debris of a collapsed building.

The earthquake, with an epicenter in the town of Sindirgi, sent shocks that were felt some 125 miles to the north in Istanbul, a city of more than 16 million people.

Sindirgi Mayor Serkan Sak told the nationwide HaberTurk television broadcaster that four people were rescued from a collapsed building in the town while rescuers were trying to reach two other people from the structure.

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