The memory card in the flight recorder of a Russian warplane downed by Turkey on the Syria border last month is damaged, Russian investigators say.

The surviving pilot of a Russian plane shot down by Turkey on the Syrian border says no warning was given, and the plane was inside Syrian airspace.

Eight senior figures from Islamic State were killed in an air strike while meeting in a town in western Iraq, but the group's reclusive leader Abu Bakr al-Baghdadi did not appear to be among them.

A suspected suicide attack kills at least 27 people and wound nearly 100 others in the Turkish town of Suruc near the Syrian border.