Haitian authorities say 28 suspected gang members were killed Tuesday when armed vigilantes joined state security forces to thwart an attack on an upscale suburb of Port-au-Prince. The bodies of the alleged gang members were decapitated and burned in the streets. It’s part of an escalating wave of violence that has spread across Haiti’s capital, where the International Organization for Migration reports some 20,000 people were displaced from their homes over the weekend. This is the U..N’s Ulrika Richardson.

Ulrika Richardson: “We have seen over the past few days really increased in terms of killings and lynching on the part of the armed gangs. … We have increasing and very steep humanitarian needs. And this is already people who live — many populations who live in very, very tough living conditions. And the situation by day is deteriorating.”

On Tuesday, the medical aid charity Doctors Without Borders said it has suspended most of its operations in Port-au-Prince following threats by Haitian police and an attack on one of its ambulances.