Four people suspected of assassinating Haitis President Jovenel Moïse have been killed in a shootout with the security forces.
Two others have been detained, while officers are still in combat with some remaining suspects in the nations capital Port-au-Prince.
Mr Moïse, 53, was fatally shot and his wife was injured when attackers stormed their home early on Wednesday.
The unidentified gunmen entered the private residence in Port-au-Prince and kill but First Lady Martine Moïse survived and has been flown to Florida where she is receiving treatment.
She is reported to be in a stable but critical condition.
Speaking after the killing, interim Prime Minister Claude Joseph called for calm and declared a nationwide state of emergency.
The state of emergency, or state of siege, allows for the banning of gatherings and use of the military for police roles, along with other extensions of executive powers.
US President Joe Biden offered condolences to the people of Haiti for the horrific assassination.
UK Prime Minister Boris Johnson, meanwhile, called it an abhorrent act and also appealed for calm.