Student hijackers free hostages

Six university students armed with hand grenades and pistols who seized an Ethiopian plane with at least 50 passengers and diverted it to Khartoum have released all their hostages and surrendered, officials said today.

‘‘All of them have been released,’’ said Ghazi Salah el-Din Atabani, Sudan’s minister of information. ‘‘The hijackers will be tried according to international laws.’’