ANKARA, Turkey — A strong earthquake shook western Turkey on Monday, causing at least three buildings that were damaged in a previous tremor to collapse, officials said. There were no immediate reports of casualties.

The magnitude 6.1 quake was centered in the town of Sindirgi in Balikesir province, according to the Disaster and Emergency Management agency, AFAD. It struck at 22:48 local time (1948 GMT) at a depth of 5.99 kilometers (3.72 miles.)

The quake, which was followed by several aftershocks, was felt in Istanbul, and the nearby provinces of Bursa, Manisa and Izmir.

At least three unoccupied buildings and a two-story shop collapsed in Sindirgi, Interior Minister Ali Yerlikaya said. The structures had already been damaged in a previous earthquake.

A total of 22 people were injure

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