ANKARA, Turkey (AP) —Turkey’s state-run news agency says authorities have detained three state railway agency employees suspected of negligence over a deadly train crash in the capital Ankara.

Anadolu Agency says the three were detained Thursday after the high-speed train heading for the city of Konya crashed into a rail engine and hit a pedestrian overpass. Nine people, including three engine drivers, were killed.

The agency did not immediately provide detail on the detained employees.

President Recep Tayyip Erdogan vowed a thorough investigation and said those responsible would be brought to justice.

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