Six bomb attacks across three cities in Sri Lanka on Easter Sunday. Most of them occurred within a single half-hour. The targets were churches and popular hotel restaurants. About 250 people were killed. Afterwards, three bombs detonate as police look for suspects. Sri Lankan officials have blamed a little-known radical Islamist group for the violence. Here’s how the Easter Sunday attacks unfolded. What they show is a level of sophistication and coordination that resulted in one of the deadliest terror attacks in modern history. The story actually begins 10 days earlier, on April 11. This document shows that Sri Lankan security forces were warned about the threats. Nothing is done to protect the churches. These are the three cities where the attacks take place on Easter Sunday. In Negombo, around 8:45 a.m., security cameras pick up this man walking into the St. Sebastian Church. He’s a suicide bomber. This attack is the deadliest of the day. Over 100 people are killed. Around the same time, three separate other attacks hit the capital nearly simultaneously. One is here at a Catholic church called St. Anthony’s Shrine. This dashcam footage gives a clue about the intensity of the blast. It blows off part of the church’s roof. At the Shangri-La Hotel’s Table One Restaurant, an Easter brunch is being served. This photo is taken moments before two suicide bombers strike that location. The third target at this time is the Kingsbury Hotel. Experts say the bombs reveal a high level of sophistication. The amount of damage suggests the attackers had expert bomb-making skills and access to military-grade high explosives. Each attack targeted confined spaces, maximizing the impact of the blasts. Within a few minutes of the first waves of bomb blasts, there are two more attacks — one at another Colombo hotel, and another at a church on the country’s opposite coast. As authorities respond, police encounter three more explosives that detonate. Three officers are killed in one of these instances. So in the first 36 hours, six bomb attacks have occurred and so have three detonations of bombs found by police. [singing] All of this proof that a very deadly day could have been even deadlier. [singing]