Russia is in a state of mourning following a tragic attack at a rock concert outside Moscow that claimed the lives of at least 137 people, including three children. President Putin has vowed to find and punish those responsible for the attack, which has been claimed by the terrorist group ISIL (ISIS).

Flags across the country have been lowered to half-mast as people gather at a makeshift memorial outside the concert hall to mourn the victims. While the rescue operation has been completed, the search for survivors continues.

In a show of solidarity, blood banks in Moscow are well stocked for the next four to six months after an outpouring of support from donors. The global community, including Pope Francis, has sent their condolences to Russia in the wake of this tragedy.

Eleven individuals, including four gunmen, have been detained in connection with the attack, with two suspects facing terrorism charges. Russian officials allege that the suspects were headed for Ukraine, although Ukraine denies any involvement.

The White House has confirmed that ISIL was solely responsible for the attack and shared information with Russia about a planned attack earlier this month. As the investigation continues, the world waits for justice to be served for the victims of this senseless act of violence.