 The Angolan government arrested Henry Okah, the spokesman of the Movement for the Emancipation of Niger Delta (MEND), the largest rebel group in Nigeria, in September 2007 on arms trafficking charges.Okah had tried to board a plane at Luanda airport bound for South Africa when authorities apprehended him.Angola and Nigeria have not signed an extradition treaty, partly because Nigeria still uses capital punishment and Angolan law forbids extraditing suspects to nations in which they may face the punishment of death.