Students killed in thier sleep and more and more people die in north-east Nigeria

Hundreds of people have died in detention facilities in north-east Nigeria as the army tries to crush an Islamist militant rebellion there, according to Amnesty International.The human rights group said some detainees died from suffocation in overcrowded cells, others from starvation and extra-judicial killings. Boko Haram is fighting to overthrow Nigeria's government to create an Islamic state, and has launched a number of attacks on schools. About 50 students were shot dead earlier this month in their hostel, in an attack blamed on Boko Haram. A state of emergency was declared in three northern states in May - Yobe, Borno and Adamawa - in response to thousands of deaths in militant attacks.