Nearly 100 people are feared dead in Angola, when the train in which they were travelling apparently hit an anti-tank mine on the track. The blast appears to be the work of the Unita rebels who have carried out a series of attacks in northern Angola recently - but this is the first time rebels have carried out sabotage of this kind. The explosion occurred on Friday afternoon as the train was travelling between the towns of Zenza do Itombe and Dondo in Kwanza Norte province, about 150km (95 miles) south-east of Luanda. The BBC's Justin Pearce reports from Luanda.