IS has posted a statement on a militant-affiliated website claiming responsibility for the attack.
Ten more bodies were found in mass graves in war-torn Libya, the country's UN-recognised government said.
The EU and Turkey pushed to mend strained ties as Ankara's foreign minister visited Brussels.
Comment: The ideals of the Arab Spring remain out of reach for many. But the quest for freedom, though long and uneven, is inevitable and unstoppable, writes Mohamed ElBaradei.
Mevlut Cavusoglu and Josep Borrell have met to discuss Turkey's EU membership and issues related to the eastern Mediterranean.
Libya, Niger and Zimbabwe have recovered their right to vote at the UN General Assembly after paying off some debts.
Libyan envoys at UN-backed talks agreed to hold a constitutional referendum before planned elections, Egypt's foreign ministry said.
Analysis: Fault lines in the Gulf crisis have long played out in the Eastern Mediterranean, but that could be set to change.
Interim UN envoy Stephanie Williams said 'Libyans have now a genuine opportunity to move past their differences and divisions' with this step
Mothers who come from countries that are on Trump's Muslim ban list are counting down the days until Joe Biden becomes president to see their children