The investigation into a deadly series of suicide bombers in Sri Lanka went into its fourth day on Wednesday. As new information about the bombings continues to emerge, some basic questions remain unanswered.
What we know about the investigation
• Police in Sri Lanka arrested Wednesday a man carrying 30 pounds of explosives and 25 mobile phones near a bomb attack carried army camp in the eastern town of Batticoloa, causing concern over a wider Terror campaign led to the attacks on Easter Sunday, which killed more than 350 people.
• The Indian secret services warn their Sri Lankan colleagues about the attack Two hours before the first bomb exploded, the Sri Lankans failed. It was the last in a series of unheeded warnings, including a message memo written at least ten days before the attack warning of the attack.
• Over 350 people were killed and around 500 injured. The victims came from more than a dozen countries, including children who served at Easter.
• One Cabinet member said Tuesday that the bombings had been in retaliation for attacks on two mosques in Christchurch, New Zealand. On Wednesday, a minister of administration and a former army chief said planning may have been in the planning for several years.
• The US embassy confirmed that agents from the Federal Bureau of Investigation provided assistance in Sri Lanka.
What we know who was killed where
• The death toll rose to at least 359. Unicef, the United Nations Children's Fund, said at least 45 of those killed were children.
• The attacks took place in three churches Three Hotels on Easter morning in three different cities around the island. Two more explosions occurred in the afternoon in and around Colombo, one in a small guest house and the other in the seemingly safe house of the suspects. In this explosion, three officers were killed in search of the attackers.
• The deadliest explosion took place at St. Sebastian's Church in Negombo, about 20 miles north of Colombo, where more than 100 people were killed.
• At least 28 people were killed in the Zion Church in Batticaloa on the other side of the East Coast island. Also, the shrine of St. Anthony, a Roman Catholic church in Colombo, was attacked with an unknown number of dead. Witnesses described there "a river of blood".
• The three hotels that were all attacked in Colombo were Shangri-La, Cinnamon Grand and Kingsbury.
• People from more than a dozen foreign lands have been killed along with many Sri Lankans. Some of the victims were Americans, the authorities said. Others were called to Australia, Britain, China, Holland, India, Portugal, Japan and Turkey according to officials and news.
What we do not know about the attacks
• The Sri Lankan officials still have to confirm whether the so-called leader, who was killed in the attack, was Mohamad Zaharan, the radical Muslim lecturer, in a security note as chief of National Thowheeth Jama & # 39; ath was said to have organized the bombing.
• Like two small, obscure groups – one of them was previously known for best for the desecration of Buddhist statues – he managed to fend off sophisticated, coordinated attacks.
• The extent to which the Islamic State or other international terrorist networks may have helped in the attacks.  • The names of the suicide bombers and now 60 people held in connection with the attacks.
• Why the authorities have failed to take substantive steps to prevent an attack after receipt of the repos is an imminent threat.
• What impact will the failure to stop the attacks have on the Sri Lankan government? The President and the Prime Minister were already involved in a fierce feud in 19459012.