A series of coordinated terrorist attacks in Paris late Friday night has left a nation in mourning and the world in shock. The latest Paris attacks left over 150 casualties, who were either killed in shooting and bombing assaults. Thus, France declared a national state of emergency and closed its borders.

The Paris attacks simultaneously transpired in at least five different locations throughout the capital including a soccer stadium where a friendly match was underway. According to CNN, some of the terrorists have bombs strapped to them while others have AK-47s. And the worst carnage happened at during a concert at the Bataclan Theater, where 122 people were killed after gunmen took many hostages before being overpowered by the French authorities.

Other gun attack sites in Paris include Rue Bichat at the site of Le Petit Cambodge restaurant in the 10^th district where 14 people were reportedly killed. While 19 died on Rue de Charonne in the 11^th district, outside a bar called La Belle Equipe and four were killed on Avenue de la Republique in the 10^th district. A reported suicide bombing near Stade de France in Saint-Denis, north of Paris, left four people killed. The venue was where the football match between France and Germany was played, BBC News reported.

The Paris attacks have also left 200 people injured, 80 of them are in serious conditions. Eight terrorists were also killed, seven of them by detonating suicide belts.Terrorism experts said the attacks bear a resemblance to the tactics that have been used by several terror groups including Al Qaeda's focus on mass casualty and visibility while the small tactical nature of the attacks has the hallmarks of ISIS and its acolytes. But the terror group responsible for the mass killings was still unidentified.

France's President Francois Hollande, who was at the Stade de France during the time of the attacks, has declared a state of emergency across the nation and security at the country's borders has been tightened, The Guardian has learned.

"We are going to lead a war which will be pitiless," Hollande said. "Because when terrorists are capable of committing such atrocities they must be certain that they are facing a determined France, a united France, a France that is together and does not let itself be moved, even if today we express infinite sorrow."

Meanwhile, the 2015 Paris attacks came after the Pentagon confidently announced that they could have killed ISIS' "Jihadi John" when a U.S. drone strike had hit the intended target in Raqqa, Syria on Thursday. Islamic State's "Jihadi John" aka Mohammed Emwazi, a Kuwaiti-born British militant who appeared in the terrorists' beheading videos. He was also the most celebrated Jihadi that was known as "Sheik of Slaughter."

Since Emwazi's death would be a significant blow to the ISIS, the MI5 is currently on high alert amid fears that the terror group is already plotting revenge attacks, The Telegraph revealed. Communications of known Islamic State fanatics are also being monitored closely and surveillance has intensified to prevent a terrorist outrage in revenge for the operation that is widely acknowledged to have resulted in Emwazi's death.

Do you think the Paris attacks are ISIS' way of bloody retribution?