In Cameroon, the number of people killed in a train crash on Friday has risen to 70, with another 600 injured. The train was travelling between the country's mains cities, Douala and Yaounde, when it came off the tracks. <br/><br/>The train was overcrowded because a bridge on the road connecting the two cities had collapsed after heavy rain. An investigation into the cause of the derailment is under way.