Officials say the blast, also wounding more than 120 people, targeted a tax collection centre in capital and most of those killed were university and other students. Two Turkish brothers are among the dead.
Turkey's defence ministry says PKK/YPG attack in the village of Tal Halef, near the city of Ras al Ayn, also wounded more than 20 people.
More than 20 people wounded as two car bombs and an explosives-rigged motorcycle blow up in a market and near a school in Qamishli city, a Britain-based war monitor says.
The casualty figure, provided by locals and rescuers, is preliminary and is expected to rise.
The car bomb exploded in the rebel-held Syrian city of Idlib, killing two people and injuring at least 11 others.
Another two dozen people were wounded as a bomb exploded outside a hotel near the international airport in Somalian capital Mogadishu, officials say.
Eight people are killed in a car bomb attack which targeted a checkpoint near the Somali parliament in Mogadishu while the second blast on a key road leading to the airport did not cause any casualties, officials say.
The Al Qaeda-linked Al Shabab militant group claimed responsibility for the bombing in Mogadishu's Waberi district.
Gunmen battled security forces in Somalia's capital Mogadishu on Friday morning, hours after insurgents launched a car bomb attack in a busy street that left at least 29 dead, police said.
Afghan officials say militants targeted Green Village, in the east of the city where some foreign workers are based, adding at least 10 children were among the wounded.
Police officials say over 100 people were also wounded when suicide attackers set off car bombs at Sahafi Hotel near a police headquarter in capital Mogadishu. Militant group Al Shabab claims responsibility for the attack.
At least six people were killed after a suicide bomber detonated an explosives-laden vehicle outside the compound of a district headquarters in Somalia's capital.
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