A spokesman for UN chief Antonio Guterres confirmed only that there was a "security incident", but gave no further details.
The West African country has seen several mass kidnappings over the years carried out either by bandits or militants, with the latest incidents sparking worries that no school is safe.
Protesters reportedly burnt tyres and blocked several roads in Ouargla after a court convicted blogger Ameur Guerrache who helped organise demonstrations against the marginalisation of the city’s inhabitants.
A group of gunmen kidnapped 317 girls from their boarding school in in the town of Jangebe, in Nigeria's Zamfara state last week.
The first blast that targeted a military vehicle carrying senior staff, killed three people and wounded several others. Casualties from the second blast that targeted a local district commissioner in Mogadishu were not immediately known,
"We ask international partners, especially the African Union and regional partners, to work with us to address the crisis in Tigray, including through action at the UN and other relevant bodies," US Secretary of State Antony Blinken said.
"We ask the United Nations to urgently fulfill its promises: that of ridding Western Sahara of colonisation, in accordance with its Charter and its resolutions," Polisario Front leader Brahim Ghali said in a speech at a refugee camp.
Supporters of Ennahda Party stage a demonstration on Saturday in the capital Tunis to strengthen national unity and for giving a message of the necessity of dialogue.
"The abducted students and staff have regained their freedom and have been received by the Niger state government," Governor Abubakar Sani Bello says.
Nigerian police and a local official said that a suspected criminal gang attacked the Government Girls Science Secondary School in Jangebe, a village in Zamfara state, kidnapping at least 300 schoolgirls.
The new interim government and future ministers are replacing Libya’s two rival administrations as part of a UN-backed transitional roadmap, which envisages holding elections in the war-torn country in December.
Troops went on a rampage and systematically killed hundreds of civilians in cold blood, which appears to constitute crimes against humanity, Amnesty International says of the violence in northern Axum city.
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