At least 27 people are killed and 226 injured in an explosion in southern Beirut near a complex used by Lebanon's militant group Hezbollah in Lebanon. A previously unknown Syrian Sunni group claims responsibility in an online video.

On 15 August 2013, a car bomb exploded in Beirut, Lebanon killing 27 people and injuring over 200 people. The car bomb was intended for the stronghold of Hezbollah. It was reportedly the "worst explosion in south Beirut" since a 1985 truck bomb assassination attempt targeting top Shiite cleric Mohammed Hussein Fadlallah. The Islamist group Aisha Umm-al Mouemeneen, also known as Brigades of Aisha, were responsible for the explosion. In their statement the group accused Hezbollah of being Iranian agents and threatened more attacks. "This is the second time that we decide the time and place of the battle ... And you will see more, God willing," However Interior Minister Marwan Charbel and other politicians blamed Israel for the attack.

Beirut is the capital and largest city of Lebanon. As of 2014, Greater Beirut has a population of 2.5 million, just under half of Lebanon's population, which makes it the fourth-largest city in the Levant region and the sixteenth-largest in the Arab world. The city is situated on a peninsula at the midpoint of Lebanon's Mediterranean coast. Beirut has been inhabited for more than 5,000 years, making it one of the oldest cities in the world.

Hezbollah is a Lebanese Shia Islamist political party and paramilitary group. Hezbollah's paramilitary wing is the Jihad Council, and its political wing is the Loyalty to the Resistance Bloc party in the Lebanese Parliament. Its armed strength was assessed to be equivalent to that of a medium-sized army in 2016.

Syria, officially the Syrian Arab Republic, is a country in West Asia located in the Eastern Mediterranean and the Levant. It borders the Mediterranean Sea to the west, Turkey to the north, Iraq to the east and southeast, Jordan to the south, and Israel and Lebanon to the southwest. It is a republic under a transitional government and comprises 14 governorates. Damascus is the capital and largest city. With a population of 25 million across an area of 185,180 square kilometres (71,500 sq mi), it is the 57th-most populous and 87th-largest country.