Close-circuit television footage from Kingsbury Hotel in Sri Lanka's Colombo shows the exact moment of the blast on Easter Sunday. The CCTVs captured the suicide bomber checking into the hotel a day earlier. He can be seen exiting his room on Easter morning and minutes later the cameras capture the explosion. 253 people were killed in bomb blasts in churches and hotels across the island nation. The Sri Lankan government believes that a local extremist group National Thowheeth Jamaath is behind the attack, while ISIS has also claimed responsibility.