Mohamed Abdellah had been in exile in Spain since 2019 when he fled Algeria after exposing alleged corruption.
The French president is heckled as he promises reparations for Algerians who fought for France.
No immediate comment from Morocco after Algeria says assassination of three nationals will not go unpunished,
Bouteflika led Algeria for 20 years, but his bid for a fifth term led to huge protests in 2019.
Despite a huge military budget, oil-rich Algeria is ill-equipped to tackle annual fires.
When Djamel Ben Ismail went to fight forest fires in Algeria, his life was cut short by a raging mob.
Algerians are clamouring for democratic reforms and the weakening the influence of the military.
Algeria is one of several Mediterranean countries to face devastating wildfires.
Twenty-six Algerians who flew from the UK have spent three weeks waiting to complete their journey.
The French president may not be able to repair relations with Algerians, argues writer Maher Mezahi.