A Kurdish militant group has claimed responsibility for an attack at Istanbul's second airport that killed a cleaner, and threatened more assaults.
The Kurdistan Freedom Falcons - an offshoot of the Kurdistan Workers' Party, or PKK - said in a statement on its website that it attacked Sabiha Gokcen International Airport with mortar guns.
It said the December 23 attack was in retaliation for the Turkish government's stepped-up military operations against the PKK.
Authorities have not disclosed the cause of the pre-dawn explosion at the airport, which also injured another cleaner and damaged three planes, saying it is still under investigation.
Turkish security forces last week launched a large-scale operation to rout militants linked to the PKK in mostly Kurdish districts.
More than 180 rebels were killed.
Register for free to continue reading
Registration is a free and easy way to support our truly independent journalism
By registering, you will also enjoy limited access to Premium articles, exclusive newsletters, commenting, and virtual events with our leading journalists
Already have an account? sign in
Join our new commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies