British and French leaders have traded accusations after at least 27 people died trying to cross the Channel in the deadliest incident since the current migration crisis began.

In a phone call with Boris Johnson on Wednesday night, French president Emmanuel Macron stressed “the shared responsibility” of France and the UK, and told Johnson he expected full cooperation and that the situation would not be used “for political purposes”, the Élysée said.

Thirty-four people were believed to be on the boat when it sank on Wednesday, leading to what the International Organisation for Migration said was the biggest single loss of life in the Channel since it began collecting data in 2014. Two survivors are in intensive care.