ISIS claimed to launch one of the deadliest attacks in recent years in Lebanon Thursday evening, when a double suicide bombing killed at least 43 people and wounded over 200 others in a southern Beirut suburb.

ABC News reports that the suburb is a stronghold for Hezbollah, a militant Shiite group. ISIS has mostly been targeting Syria and Iraq and has not recognized any affiliate in Lebanon thus far. However, Lebanon has seen deadly situations due to the civil war in the neighboring country.

The bombs were detonated only minutes apart during rush hour in the Hezbollah stronghold. Ambulances rushed to the scene and Lebanese military, paired with Hezbollah gunmen, would not allow anyone to enter the area. Hezbollah has asked for people to disperse and leave public areas as well as be on the lookout for suspicious actions.

“There’s a lot of shattered glass on the street, a lot of blood, and it’s really just a scene of chaos and carnage,” journalist Tamara Qiblawi told CNN shortly after the blasts.

After the attack, ISIS members posted on various social media outlets that they carried out the attacks.

Hezbollah has been fighting alongside Syrian government forces led by Syrian President Bashar al-Assad. The suburb has been attacked in the past and Sunni militant groups continue to threaten the stronghold, according to ABC News.

Lebanese security officials told Fox News that the first attacker detonated the bomb inside a mosque then shortly after, the second attack was carried out in a bakery located nearby. A third attacker was found dead, close to the second explosion. His vest was still intact.

According to CNN, another would-be attacker who survived the bombing was found. Lebanese officials state that he was an ISIS recruit. He has been taken into custody and told authorities that he, and the other attackers arrived in Lebanon from Syria two days ago.

A national day of mourning was declared by Lebanon Prime Minister Tammam Salam. He called for Lebanon’s Parliament to stop their arguments and to begin functioning again. In fact, the government in Lebanon has been so disjointed that there is currently a trash crisis.

“I pray that this tragedy is enough to wake up politicians so that they can put their differences aside so we can protect the country,” Salam said in a statement, according to the Washington Post.

In addition to Thursday’s attacks, ISIS also released a new video on Thursday, threatening to attack Russia for revenge on the recent series of Russian airstrikes in Syria. The militant in the video stated in Russian: “Soon, very soon, the blood will spill like an ocean.”

Russian state security services are analyzing the video, according to Kremlin spokesman Dmitry Peskov.

“I do not know the authenticity of this video, I do not know the authenticity of these sources, but in any case no doubt this will be material for review by our special (security) services,” Peskov told journalists on a conference call, according to Business Insider.

USA Today reports another suicide bombing took place Friday at a Baghdad memorial service for a Shiite fighter. At least 22 have been reported dead and at least 43 are wounded. At this time, ISIS has not claimed responsibility for the attack, but they are well known for targeting large Shiite gatherings. The radical Sunni group believes that Shiites are apostates who have strayed from Islam.