After two days of lengthy negotiations in Doha, Hamas has named its Gaza leader Yahya Sinwar as successor to former political chief Ismail Haniyeh, who was assassinated in Tehran last week, the group said on Tuesday.
Sinwar, who spent half his adult life in Israeli prisons, was the most powerful Hamas leader left alive following the assassination of Haniyeh.
The announcement comes at a moment of soaring tensions in the Middle East, as Iran and its allies threaten retaliation for the killing of Haniyeh, which they blame on Israel.
Israel has not claimed responsibility for the assassination but it has said it killed other senior leaders, including Hamas deputy leader Saleh al-Arouri, who was killed in Beirut, and Mohammed Deif, the movement's military commander.
Born in a refugee camp in the southern Gaza city of Khan Younis, Sinwar, 61, was elected as Hamas' leader in Gaza in 2017 after gaining a reputation as a ruthless enforcer among Palestinians.
Several people were killed during unrest in Iran, Iranian media and rights groups said on Thursday, as the biggest protests to hit the country for three years over worsening economic conditions sparked violence in several provinces.
Russia and Ukraine accused each other of targeting civilians over the New Year, with Moscow reporting a deadly strike on a hotel in territory it occupies in southern Ukraine while Kyiv said there had been another broad attack on its power supplies.
Dozens of people were killed and 100 injured, most of them seriously, after fire tore through a crowded New Year's Eve party in the upscale Swiss ski resort of Crans-Montana, officials said on Thursday.
Zohran Mamdani was sworn in as New York City mayor in the first minutes of the New Year at the historic City Hall subway station, with his wife Rama Duwaji standing by his side.