The driver of a train that crashed in central Tanzania killing 281 people and injuring hundreds of others has been arrested.
Police said God Chiwelesa was being interrogated by criminal investigations officers.
"He must explain because he was driving the train," said spokesman Laurian Tibaisana.
The train was carrying more than 1,200 people when it raced backward down a hill at 125mph and smashed into a lumbering freight train on Monday.
Survivors said the driver jumped off the train when it started rolling backward, escaping with minor injuries.
The train had stopped on the crest of a hill because of engine problems and mechanics tried to make repairs. Then the brakes failed and the train began rolling backward.