Qatar has condemned the explosion which targeted a police-training centre in the Libyan city of  Zletin on Thursday.   
The Ministry of Foreign Affairs also condemned attacks on Ras Lanuf and Sidra port, describing them as “criminal acts that target the security and stability of Libya”.
The ministry renewed its call on all parties involved in Libya to put their differences aside in order to guarantee security and stability to the Libyan people.  
The ministry expressed Qatar’s condolences to the families of the victims, wishing the injured a swift recovery.
Meanwhile, the EU has urged Libyan politicians to back a unity government.
European Union foreign affairs chief Federica Mogherini also said the EU would give Libya 100mn euros ($108mn) to battle the Islamic State (IS) group, saying the security situation “needs to be tackled immediately”.
She told reporters in Tunis that the funds would be available from the first day the unity government comes to power.
Mogherini met separately in a Tunis suburb with Fayez al-Sarraj, a businessman who was named in a UN-brokered national unity government as prime minister designate, and Libyan lawmakers.
IS said one of its members, Abdallah al-Muhajer, “detonated a truck bomb in the middle of a base belonging to the apostate Libyan forces in the city of Zliten... killing nearly 80 of them and wounding 150”.
A security source had said more than 50 people were killed in the attack on a police training school, which left buildings charred and turned cars into twisted wrecks.
It was the deadliest single attack in Libya since the 2011 revolution that toppled longtime dictator Muammar Gaddafi.