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WARSAW, Poland (AP) — An official says an investigation has found that errors made by insufficiently trained traffic controllers caused the collision of two trains that killed 16 in southern Poland last year.

Transport Minister Slawomir Nowak said Friday that one train traffic controller directed a Warsaw-to-Krakow train to a wrong track and another nearby controller sent a train going in the opposite direction to the same track, despite warnings from the safety system.

Sixteen people were killed and dozens were injured when the trains collided near the village of Szczekociny in March. Nowak was quoting a report by the state commission for investigating railway accidents, which found that the controllers were insufficiently trained. Prosecutors have pressed charges against the controllers, one of whom remains under psychiatric care.