A bus from Setif plunges into a ravine in Boumerdes province on Friday and kills 25 people while injuring 44.
The vehicle travels from the eastern city of Setif when it leaves the road in the El Karma area about 50 kilometres east of Algiers.
It tumbles down the slope and comes to rest at the bottom. Local time records put the moment at around 9:41 in the morning.
Civil Protection teams reach the site within minutes.
They bring ambulances and intervention trucks and begin pulling survivors clear.
Crews work for several hours as they move the injured to hospitals in Boumerdes and nearby towns.
Meanwhile, Prime Minister Sifi Ghrieb arrives at the scene.
He speaks with the rescue workers and later goes to the University Hospital of Boumerdes to check on some of those who survived.
The interior minister also joins officials at the site.
In the hours that follow, President Abdelmadjid Tebboune declares three days of mourning. State media carries the announcement as the country marks the loss.
Authorities open an investigation into why the bus left the road.
Officials say the cause remains unclear at this stage. Road safety records from the previous year list 3,838 deaths and more than 37,000 injuries from traffic crashes across Algeria.
Similar incidents occurred in the months before this one, including a crash near Algiers last August and another in the south late last year.
Rescue work continues into the afternoon as teams clear the site and confirm the final numbers.
