Lebanese municipality workers clear debris from the site of a twin bombingattack in the area of Burj al-Barajneh in Beirut's southern suburb on November 13, 2015.
The blasts heightened fears that ISIS is determined to retaliate as an effect of Hezbollah's military intervention in the Syrian war on the side of embattled President Bashar Assad's forces.
Hassan Nasrallah, chief of Lebanon's powerful Shiite Muslim movement Hezbollah, strongly condemned Saturday the Islamic State group's attacks in Paris that killed at least 129 people.
Health Minister Wael Abou Faour, speaking from the scene on a street of shops where vendors also sell from stalls, said numerous injured were in serious condition.
It is the first attack in more than a year and the worst bombing in Lebanon since the civil war ended in 1990.
According to an Associate Press report, the first explosion took place outside a Shiite mosque and the other at a nearby bakery.
The claim could not be independently verified, but the statement followed the usual format of IS claims of responsibility and was circulated on jihadist online accounts.
In a statement posted on Twitter [P.TV have chosen not to publish it], IS said its members detonated a bike loaded with explosives and, when people gathered, another suicide bomber blew himself up among them. It claimed the explosives were delivered by a motorbike.
At least 971 Hezbollah fighters have been killed in Syria, according to the Britain-based Syrian Observatory for Human Rights monitor.
Friday, families were preparing to bury their dead as the country observed a day of national mourning including the closure of public and private schools.
"The barbaric crime... did not target just one region or sect but all of Lebanon from one end to the other", Salam said.
On Thursday, UN Secretary-General Ban Ki-moon issued a statement slamming the attacks and calling for "those responsible for this terrorist act to be swiftly brought to justice".