Update: 4 suspected Islamic State militants detained by Turkish police

Police have detained 12 suspected Islamic State militants in the Turkish capital, Ankara, and were searching for eight others, state media reported, as the US Embassy was closed due to an unspecified security threat.

Update: 14.20pm: Turkish police have detained four Islamic State suspects as part of an investigation into a possible attack on the US Embassy in Ankara, the country's state-run news agency has reported.

The embassy was closed today over an unspecified security threat.