Tougher screening of passengers wanting to fly to the US has been condemned as unfair by Nigeria - one of the nations singled out for special checks.

Information Minister Dora Akunyili said the rules, brought in after a Nigerian allegedly man tried to blow up a plane, discriminated against 150m Nigerians.

Bomb suspect Umar Farouk Abdulmutallab did not represent Nigeria, she said.

Nigerians are among 14 nations whose nationals face stiffer rules including body searches and luggage checks.

Four other African countries - Algeria, Libya, Somalia and Sudan - are also subject to the new measures.

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