Family members and relatives grieve for victims of a car bombing outside the forensic morgue on March 14, 2016 in Ankara, Turkey.

Turkish warplanes struck Kurdish militant camps in northern Iraq on Monday, a day after 37 people were killed in an Ankara car bombing that security officials said involved two fighters - one female - from the Kurdistan Workers Party (PKK).

Sunday's attack, tearing through a crowded transport hub a few hundred meters from the Justice and Interior Ministries, was the second such strike at the administrative heart of the Turkish capital in under a month.