Thousands of ISIS fighters are being held by Kurdish-led forces in northeastern Syria, but the Turkish assault threatens the security of the detention centers there.
Louisa Vesterager Jespersen and Maren Ueland were found stabbed to death in a remote mountain camp site Monday.
The kidnappers said they will not release the students until they have achieved their separatist goals.
The two groups are battling for territory in the remote north of the country.
Fighters seemed to struggle with the leapfrogging exercises in particular.
The spread of drone technology has allowed militant groups to build de facto air forces.
Many U.S. officials favor greater cooperation with Pakistan to combat militancy, while others urge a tougher approach.
Duterte had previously warned the international community from "meddling" in the Philippines' affairs.
Record-keeping was poor for the U.S. Army arms transfers in Iraq and Kuwait, the government audit obtained by Amnesty International says.
Spanish authorities say the separatists will not get immunity for any crimes.
Facing military defeats in Iraq and Syria, the Islamic State group may be preparing a mass retreat to war-torn Libya.
The forces posted pictures of desert hideouts covered with sand and grass and said the sites were being used for training. Shells, suicide belts and booby traps had been recovered there, the statement added.
A new poll finds that more than half of French people worry schools are not safe enough.
The tech firms provided information about the suspects' use of both social networks.
The defense project would protect the 60 kilometer length of the Israel-Gaza border.
Erdogan accused Moscow of transferring weaponry to the PKK via Iraq and Syria.
Shelling in retaliation for rocket fire in Turkish border town of Kilis.
Sunday's airstrikes by Gulf Arab states were in coordination with a ground offensive further west.
Nigerian forces freed the captives in the northeastern state of Borno.
Air strikes come after Kurdish Militants blamed for killing 37 people in Ankara car bombing.
The militant group burnt the homes of villagers and killed scores near Maiduguri.