(CNN) -- Gunshots rang out and the smell of tear gas filled the air in a crowded tent city outside Haiti's destroyed presidential palace Monday night in one of the most serious confrontations since an earthquake decimated the city.
CNN crews saw discarded tear gas canisters scattered on the ground. It was unclear who opened fire or what prompted the altercation.
Witnesses told CNN that at least two youths were hit by rubber bullets and injured.
Thousands of homeless Haitians have been living in tents in the area since an earthquake struck Haiti on January 12.
Angry demonstrators in the area lit tires on fire. Earlier in the day, student demonstrators in the area protested what they said was government inaction in the aftermath of the earthquake.