Al-Manar correspondent said that one of the injured people died on Friday from wounds sustained in the blast, raising the death toll to 43 martyrs.
State Commissioner to the Military Court Judge Sakr Sakr inspected the blasts scene in Beirut southern suburb (Dahiyeh) to know the latest developments and details related to the attack, al-Manar correspondent said.
Meanwhile on Friday, Both public and private schools were ordered closed following a circular issued by Education Minister Elias Bou Saab.
Flags were flown at half mast at the Grand Serail and all public buildings after Prime Minister Tammam Salam announced a national day of mourning.
Thursday blasts which went off in the busy Ain al-Sikkeh neighborhood injured more than 200 others.
Lebanese Red Cross official George Kettaneh said five of the wounded were in critical condition.
The Lebanese Army said two men wearing suicide vests carried out the attacks.
A military statement added that the body of a third suicide attacker who had failed to blow up himself was found at the scene of the second blast.
ISIL Takfiri group (so-called Islamic State in Iraq and Levant) claimed responsibility for the attack.
Lebanon was rocked by a wave of suicide attacks in the years of 2013 and 2014. Dozens of innocent civilians were martyred in the attacks targeted several areas in Dahiyeh and Hermel in Bekaa.