Police in the Liberian capital, Monrovia, fired tear gas on Wednesday to disperse a stone-throwing crowd agitating to leave a neighbourhood placed under quarantine because of the Ebola virus.
Witnesses said there were no injuries.
Liberian authorities introduced a nationwide curfew on Tuesday and put the neighbourhood – West Point – under quarantine.
The rundown area has been hit by Ebola, which has killed more than 1,200 people in four West African countries, five of whom have died in Nigeria.
Meanwhile, Cameroon has closed all its borders with Nigeria in a bid to halt the spread of the Ebola virus, state radio said on Tuesday.
“The government has taken the decision to protect its population because it is much better to prevent than cure the Ebola virus,” Minister of Communications and government spokesman, Issa Tchiroma Bakary, told Reuters.