Four persons died on Thursday in a helicopter crash in the Douira neighborhood of Algiers.
The helicopter, which belongs to the Tassili Airlines Company, was rented to the National Agency for Studies and Follow-up on Railways Investment.
The spokesperson of Tassili Airlines, Karim Bahard, told APS news agency that the victims included the pilot and his assistant.
He added that two air photographers, who were conducting cartography of the new railway line linking Algiers downtown to the western suburb of Zeralda, also died.
In the past three years, the North African nation has witnessed plane crashes, mostly of military aircraft.
The last accident took place in mid-June, when a military helicopter crashed in the province of Naama, 700 km southwest of Algiers, leaving one soldier dead.
The most fatal plane crash was reported in February 2014, when a C-130 Hercules aircraft belonging to the Algerian Air Force crashed in Oum El Bouaghi province, 400 km east of Algiers, killing 77 soldiers.
In April 2015, a military helicopter crashed in the southern province of Illizi, killing two soldiers.
In November 2014, an Algerian Air Force MIG-25 ‘Foxbat’ fighter crashed, but the pilot managed to eject himself out of the plane and survived.