Missouri state representative Ben Baker’s daughter and her husband were reportedly ambushed when leaving a church

The daughter and son-in-law of a US Republican politician are among three Christian missionaries who have been killed by gang members in Haiti as it emerged that the long-awaited deployment of an multinational security force tasked with rescuing the Caribbean country from months of bloodshed had been delayed.

Ben Baker, a Republican state representative from Missouri, announced the news of the couple’s murder on Facebook late on Thursday, writing: “My heart is broken in a thousand pieces. I’ve never felt this kind of pain.”

An advance group of Kenyan officers, part of a larger UN-backed ‘support mission’ to stabilize Haiti, landed in Port-au-Prince

Kenyan special forces police who have spent time battling al-Shabaab fighters in east Africa are expected to arrive in Haiti in the coming days, as the US secretary of state, Antony Blinken, warned the Caribbean country was “on the precipice of becoming an all-out failed state”.

A small advance group of Kenyan officers – part of a larger UN-backed “multinational security support mission” designed to stabilize Haiti after months of mayhem – landed in the capital, Port-au-Prince, late on Monday as the city’s airport reopened nearly three months after a gang uprising forced it to close.