Updated

Amnesty International is calling on the Sudanese government to investigate the killing of an 18-year-old university student it says came at the hands of intelligence agents.

The London-based rights group said in a Wednesday statement that engineering student Abubakar Hassan Mohamed Taha was killed a day earlier in North Kordofan State by a gunshot wound to the head after intelligence agents opened fire on students marching peacefully to submit pro-opposition candidates for campus elections.

Amnesty's regional director Muthoni Wanyeki described the attack as "yet another shocking episode in a series of human rights violations against university students across Sudan and underlines the government's determination to put out the last vestiges of dissent."

Amnesty says another 27 students were wounded in the shooting, five of them seriously.