"Russian Concert Hall Shooting: Updates on Death Toll, Suspects, and International Response"

A deadly attack at a Moscow concert venue has left over 130 people dead, with ISIS claiming responsibility. Russian President Putin has declared a day of national mourning and is vowing to punish the perpetrators. He has also accused Ukraine of involvement, a claim vehemently denied by Ukrainian officials. The attack has prompted Putin to seek closer cooperation in fighting terrorism with Turkey and Syria. North Korean leader Kim Jong Un has offered condolences, and ISIS has released a graphic video purportedly showing the attack. The White House has stated there is no evidence of Ukrainian involvement, and four suspects have been detained and are being questioned by Russian investigators.