A Congo police spokesman says at least two people, a police officer and citizen, have been killed in clashes between police and protesters in eastern Congo.

Col. Pierrot Mwanamputu said the two died early Monday amid demonstrations in Goma to protest President Joseph Kabila's continued rule and the delay of elections.

The protesters are demanding that Kabila step down at the end of the year if new elections are not held.

North Kivu commissioner Gen. Nyembo Placide said investigations are underway to determine who organized the march.

Congo has seen widespread anger over Kabila's extended stay in power after his mandate ended in December and elections were delayed.

The U.S. has warned that Congo will not have the support of the international community if elections are not held in 2018.