There are calls from the US and Britain for an investigation after Ukrainian soldiers of the Azov regiment were reportedly injured by a "poisonous substance" during a Russian attack on the port city of Mariupol. No evidence has yet been gathered. The UK foreign secretary says it would be "a callous escalation" of the war. The Pentagon says it's "deeply concerning". Ukraine's President Volodymyr Zelensky has already expressed his fears that Russia could deploy chemical weapons in his country.

There are calls from the US and Britain for an investigation after Ukrainian soldiers of the Azov regiment were reportedly injured by a "poisonous substance" during a Russian attack on the port city of Mariupol. No evidence has yet been gathered. The UK foreign secretary says it would be "a callous escalation" of the war. The Pentagon says it's "deeply concerning". Ukraine's President Volodymyr Zelensky has already expressed his fears that Russia could deploy chemical weapons in his country.

Worsening violence in parts of the Haitian capital has renewed fears of a loss of access to the northern part of the country. The violence comes as local gangs fight for power.

The Caribbean island of Hispaniola is home to two countries: Haiti and the Dominican Republic. Both have a population of around 10 million — but that's about where their similarities end.

A UN Security Council resolution called for a one-year embargo on all economic resources owned or controlled by Haiti's Jimmy Cherizier, who is the leader of the "G9 Family and Allies" gang.

Haiti is grappling with multiple crises: a cholera outbreak in the capital, political instability, soaring inflation and gangs blocking fuel deliveries at the main port. The UN Security Council is divided over how to help.

Haiti is grappling with multiple crises: a cholera outbreak in the capital, political instability, soaring inflation and gangs blocking fuel deliveries at the main port. The UN Security Council is divided over how to help.

More than 150 gangs are active in Haiti, where they impose their law on a powerless state. Most of them are located in the capital Port-au-Prince, which they largely control. Massacres, stray bullets, kidnappings: everyday Haitians are the first victims of their violence. FRANCE 24's Observers investigated their abuses in this special programme: "Haiti: in the grip of the gangs".

The new policy represents a major change to US immigration rules, with President Joe Biden telling migrants: "Do not just show up at the border."

The Haitian government is under mounting pressure amid violent protests by police who accuse interim Prime Minister Ariel Henry of inaction. The UN is considering sending troops to stabilize the nation in crisis.

Volker Türk said he feared that the turmoil in Haiti was not getting "the urgent spotlight" it needed. The Caribbean nation has been mired in turmoil, with armed gangs controlling large parts of the capital.

Some 531 people have been killed so far this year in Haiti as a result of ongoing violence and unrest. There are estimates that armed gangs now control about half of the country, including the capital Port-au-Prince.