In a rare admission, the US military has acknowledged it killed two civilians in an airstrike in Somalia last year – following pressure from human rights groups and Congress.

US Africa Command said a strike near the town of Eel Buur had killed two civilians and four militants, not five militants as originally reported.

It described the killing of the civilians as an isolated occurence.

The rights group Amnesty International says it has documented the deaths of 14 civilians during five US airstrikes in Somalia.

The number of strikes has increased sharply in recent months.