A journalist saw the bodies of two people lying in a mosque in Bangui's PK5 Muslim district yesterday, while a dozen others were wounded there, in clashes between supporters and opponents of the closely-watched referendum.
Fire from heavy machine-guns and rocket launchers raged around a PK5 school where voters were waiting to cast their ballots, prompting UN peacekeepers to move in to protect residents.
The proposed constitution would limit presidential tenure to two terms, fight institutional corruption and crimp the power of armed militias, blamed for years of chaos and terror.
If adopted, it would usher in the sixth republic since independence from France in 1960 and mark the 13th political regime - underlining the chronic instability undermining the country.
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Polling stations closed at 6:00 PM (2230 IST). Results are expected in the next three days.
Among the latter were backers of ousted president Francois Bozize, whose candidacy for the upcoming presidential election has been rejected by the constitutional court.
The Central African Republic plunged into its worst crisis since independence after longtime Christian leader Bozize was ousted by rebels from the Seleka force in March 2013, triggering a wave of tit-for-tat violence with "anti-balaka" militias.
Despite the presence of 11,000 UN and French peacekeepers, part of the impoverished country remains out of bounds, under the control of either rebel chieftains or bandits.
"We are here, we will stay with them on the battlefield. They (PK5 residents) will be able to vote, they will vote until nightfall if need be," Keita pledged.