Just over 5,300 students were sitting the second day of the baccalaureate exams at the time of the explosion early yesterday afternoon in Bangui, the capital of the deeply poor nation.

In the ensuing panic, supervisors and students tried to flee, some jumping from the first floor of the school.

The injured were transported by ambulance, on the back of pickup trucks or by motorbike taxi, AFP journalists saw.

“I would like to express my solidarity and compassion to the parents of the deceased candidates, to the educational staff, to the students,” president Faustin Archange Touadera said in a video published on his party’s Facebook page.

Touadera, who is attending a summit of the Gavi vaccine alliance in Brussels, also announced three days of national mourning.

According to a document circulating on social media and authenticated by the health ministry, 29 deaths were registered by hospitals in the city.

“The hospital was overwhelmed by people to the point of obstructing caregivers and ambulances, a health ministry source stated.

UN peacekeepers, police and other security were seen around the Barthelemy Boganda high school and hospitals.

Education minister Aurelien-Simplice Kongbelet-Zingas said in a statement yesterday that “measures will be taken quickly to shed light on the circumstances of this incident”.

The minister added that a further statement would follow regarding selection of a date for the students to resume their exams programme.

The Republican Bloc for the Defence of the Constitution (BRDC), a coalition of opposition parties, condemned what it termed “the irresponsibility of the authorities in place, who have failed in their duty to ensure the safety of students and school infrastructure”.

The CAR is among the poorest countries in the world and, since independence from France in 1960, has endured a succession of coups, authoritarian rulers and civil wars.

The latest civil war started more than a decade ago.

The government has secured the main cities and violence has subsided in recent years.

But fighting occasionally erupts in remote regions between rebels and the national army, which is backed by Wagner mercenaries and Rwandan troops.

Municipal, legislative, and presidential elections are scheduled for August and December of this year but UN experts are calling for urgent institutional reform of the electoral authority before the polls and for “transparent internal governance,” as tensions between the government and the opposition intensify.