The attacks this week point to an escalation of violence as the situation worsens and gangs overwhelm security forces, including a multinational force.

At least one U.S. airline on Friday temporarily canceled flights to Haiti’s capital after gang members opened fire and hit a U.N. helicopter flying near the country’s main airport. Spirit Airlines said in a statement to The Associated Press that its daily flight from Fort Lauderdale to Port-au-Prince has been suspended

An ongoing escalation in gang attacks in Haiti’s capital is once more leading air carriers to suspend travel. On Friday, both Spirit Airlines and the United Nations cited the deteriorating security situation as the reason why they put flights on hold.