• The leader of Thoughheeth Jama’s, Mohammed Zaharan, is a well-known extremist who has spent time in both India and Sri Lanka, and who has predicted hateful messages online in recent years.
• The Sri Lankan government acknowledged that more than 10 days before the attacks, a foreign intelligence agency gave the country’s security officers a detailed warning of a possible threat to churches by Thowheeth Jama.
• That the country’s security agencies did not act aggressively on the warnings is called a “colossal failure of the intelligence service” and has created a crisis for the government.
• A forensic analysis of body parts found that most of the attacks had been carried out by single bombs, but that two men had attacked the Shangri-La Hotel in Colombo.
• One of the suicide bombers was arrested a few months ago on suspicions of having vandalized a statue of Buddha, a very provocative act in Sri Lanka, a Buddhist majority island nation in the Indian Ocean.
• In Washington, intelligence and counter-terrorist analysts examined any links between the Islamic state and the attackers, but from Monday the afternoon had not reached any definitive conclusions.
What we know about who was killed and was
• The assault took place at three churches and three hotels on Sunday morning in three separate cities across the island. Two subsequent explosions occurred in the afternoon in and around Colombo, one in a small guest house and the other was the suspicious true safe house. Three officers looking for the attackers were killed in that blast.
• The deadliest of the explosions appeared to be in St. Sebastian’s Church in Negombo, about 20 miles north of Colombo, where at least 104 were killed.
At least 28 people were killed at the Zion Church in Batticaloa, across the island on its east coast. St. Anthony’s Shrine, a Roman Catholic church in Colombo, was also attacked with an unknown number of dead. Witnesses described “a river of blood” there.
• In addition to Shangri-La, Kinnamon Grand and Kingsbury hotels, even in Colombo, were attacked.
• At least 36 of the dead were foreigners, several of them American, the authorities said. Others were British, Chinese, Dutch, Indian, Portuguese, Japanese and Turkish citizens, according to officials and news reports.
• How a small, obscure group that was previously best known for desecrating Buddhist statues managed to pull off sophisticated, coordinated attacks.
• Which international terrorist network or network, if any, helped the attacks.
• The names of the suicide bombers and the 24 people held in connection with the attacks.
• Why Catholics seem to have been designated in the bombings in a Buddhist majority state with a significant Hindu minority.
• Why the authorities failed to take significant steps to try to prevent attacks after receiving reports of an imminent threat.
• What effect of the failure to stop the attacks will have on the Sri Lankan government, where the president and prime minister were already engaged in a bitter feud.
• How many of the approximately 500 injured people were in critical condition, and what the final death could be.