Could have to do with this?
" The Embassy has received notice of large demonstrations planned for Sunday, November 18 in Port-au-Prince, and possibly other locations. In response, out of an abundance of caution, the Embassy is requiring its American employees to shelter in place beginning at 12:00 pm on Saturday, November 17, 2018."
https://ht.usembassy.gov/security-alert-u-s-embassy-port-au-prince-haiti-november-9-2018-3-2-3-2-2/