UN chief invokes article 99 on Gaza in rare, powerful move

Secretary-General Antonio Guterres has invoked what is widely considered to be the most powerful diplomatic tool at his disposal.

In a letter to the UN Security Council, Guterres invoked Article 99 of the UN Charter, which states that "the Secretary-General may bring to the attention of the Security Council any matter which in his opinion may threaten the maintenance of international peace and security".

The letter represents the first time Guterres has invoked the article since he took over the role of UN secretary-general on January 1, 2017.