THIRTY people died when robbers turned their guns on passengers travelling in night buses in two separate incidents in southeast Nigeria this week. In both incidents, the robbers tried to stop the buses in the early hours of Thursday morning and opened fire when the drivers tried to drive off, police in Awka said. One shooting took place in Onitsha, and the other in Oba, in Anambra State, police said here, confirming a report in the newspaper Vanguard. A total of 30 people were killed and a similar number received gunshot wounds and are being treated in hospital, police said. Attacks take place frequently in Nigeria on private cars and buses travelling at night where crime levels are high and police often appear unable to combat crime.