The vehicle of the United Nations Mission for Justice Support in Haiti (MINUJUSTH) lost the use of its brakes while driving in the capital and collided with a collective taxi -- known as a tap-tap -- according to witnesses.
An investigation is underway to determine the specific cause of the accident.
"It is with profound sadness that the United Nations has learned of the deaths of four people as a result of a road accident involving a public transportation vehicle and a UN Armored Personnel Carrier (APC) that occurred tonight," it said in a statement.
MINUJUSTH -- which currently includes 995 police officers -- was deployed to Haiti in October 2017 to succeed another UN mission created in 2004 following the ouster of president Jean-Bertrand Aristide.
The mission's mandate is scheduled to end in October 2019.
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