Bombings since start of 2015 have mostly been blamed on ISIL and armed Kurdish groups.
At least 199 people detained after twin bombings claimed by a Kurdish group left 44 people dead in Istanbul.
TAK, a PKK splinter group, say two fighters died in Saturday’s deadly blasts which targeted the police in Turkish city.
Three foreign nationals prime suspects for airport killings as Turkish officials say evidence points to ISIL.