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KHARTOUM, Sudan (AP) _ Six university students armed with hand grenades and pistols seized an Ethiopian plane carrying at least 50 passengers Thursday and diverted it to Khartoum. The attackers released all their hostages hours later and surrendered, officials said.

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

There were no immediate reports of serious injury among the hostages.