A magnitude 6.1 earthquake has struck Turkey’s northwestern province of Balikesir, killing at least one person and causing about a dozen buildings to collapse.

The Sindirgi apartment building was one of the few inhabited structures to fall, leading authorities to detain its owner and builder on suspicion of “causing death and injury by negligence,” Justice Minister Yilmaz Tunc confirmed.

An earthquake of 6.1 magnitude struck the Sindirgi district of Balikesir province in Turkey over the weekend. A total of seven aftershocks with a magnitude above 3.0 have occurred since then.