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MONROVIA (Reuters) - 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.