Leaders of the West African regional bloc Ecowas have condemned the violence that erupted in various parts of Sierra Leone on Wednesday.
Sierra Leoneans have been rallying against the high cost of living, corruption and police brutality.
There are demands for the resignation of President Julius Maada Bio.
Some protesters and policemen were killed in violent protests in some cities on the third day of protests, with the government imposing a nationwide curfew.
In a statement in Abuja, Ecowas called on all to obey law and order and the perpetrators of the violence to be identified and brought to justice.
Protesters on Wednesday blocked off the main access into the country's Lungi airport and clashed with security agencies.
President Bio is currently out of the country with his family and has left Vice-President Mohamed Juldeh Jalloh in charge.
The vice-president announced a nationwide curfew on Wednesday in a short state broadcast.
He said security forces had been authorised to deal with lawbreakers, accusing the protesters of destroying and burning down public facilities.
Sierra Leone is due to go to the polls next year next year to elect a new president. The protesters say that President Bio should not seek re-election.