Sri Lankan security personnel keep watch outside the church premises following a blast at the St. Anthony's Shrine in Kochchikade, Colombo on April 21, 2019. - Explosions have hit three churches and three hotels in and around the Sri Lankan capital of Colombo, police said on April 21. (Photo by ISHARA S. KODIKARA / AFP)

Ambulances are seen outside the church premises with gathered people and security personnel following a blast at the St. Anthony's Shrine in Kochchikade, Colombo on April 21, 2019. - Explosions have hit three churches and three hotels in and around the Sri Lankan capital of Colombo, police said on April 21. (Photo by ISHARA S. KODIKARA / AFP)

An ambulance is seen outside the church premises with gathered security personnel following a blast at the St. Anthony's Shrine in Kochchikade, Colombo on April 21, 2019. - At least 42 people were killed April 21 in a string of blasts at hotels and churches as worshippers attended Easter services, a police official told AFP. (Photo by ISHARA S. KODIKARA / AFP)

Sri Lankan security personnel keep watch outside the church premises following a blast at the St. Anthony's Shrine in Kochchikade, Colombo on April 21, 2019. - Explosions have hit three churches and three hotels in and around the Sri Lankan capital of Colombo, police said on April 21. (Photo by ISHARA S. KODIKARA / AFP)

Sri Lankan security personnel keep watch outside the church premises following a blast at the St. Anthony's Shrine in Kochchikade, Colombo on April 21, 2019. - Explosions have hit three churches and three hotels in and around the Sri Lankan capital of Colombo, police said on April 21. (Photo by ISHARA S. KODIKARA / AFP)

Sri Lankan security personnel stand guard at the cordoned off entrance to the luxury Shangri-La Hotel in Colombo on April 21, 2019 following an explosion. - At least 42 people were killed April 21 in a string of blasts at hotels and churches in Sri Lanka as worshippers attended Easter services, a police official told AFP. (Photo by ISHARA S. KODIKARA / AFP)

Sri Lankan security personnel keep watch outside the church premises following a blast at the St. Anthony's Shrine in Kochchikade in Colombo on April 21, 2019. - At least 137 people were killed in Sri Lanka on April 21, police sources told AFP, when a string of blasts ripped through high-end hotels and churches as worshippers attended Easter services. (Photo by ISHARA S. KODIKARA / AFP)

Sri Lankan hospital workers transport a body on a trolley at a hospital morgue following an explosion at a church in Batticaloa in eastern Sri Lanka on April 21, 2019. - A series of eight devastating bomb blasts ripped through high-end hotels and churches holding Easter services in Sri Lanka on April 21, killing nearly 160 people, including dozens of foreigners. (Photo by LAKRUWAN WANNIARACHCHI / AFP)

Sri Lankan Special Task Force (STF) personnel gesture outside a house during a raid -- after a suicide blast had killed police searching the property -- in the Orugodawatta area of the capital Colombo on April 21, 2019, following a series of blasts in churches and hotels. - A string of blasts ripped through high-end hotels and churches holding Easter services in Sri Lanka on April 21, killing at least 156 people, including 35 foreigners. (Photo by ISHARA S. KODIKARA / AFP)

EDITORS NOTE: / Sri Lankan security personnel walk past dead bodies covered with blankets amid blast debris at St. Anthony's Shrine following an explosion in the church in Kochchikade in Colombo on April 21, 2019. - A string of blasts ripped through high-end hotels and churches holding Easter services in Sri Lanka on April 21, killing at least 156 people, including 35 foreigners. (Photo by ISHARA S. KODIKARA / AFP)

Sri Lankan security personnel keep watch outside the church premises following a blast at the St. Anthony's Shrine in Kochchikade, Colombo on April 21, 2019. - Explosions have hit three churches and three hotels in and around the Sri Lankan capital of Colombo, police said on April 21. (Photo by ISHARA S. KODIKARA / AFP)

Sri Lankan security personnel walk through debris following an explosion in St Sebastian's Church in Negombo, north of the capital Colombo, on April 21, 2019. - A series of eight devastating bomb blasts ripped through high-end hotels and churches holding Easter services in Sri Lanka on April 21, killing nearly 160 people, including dozens of foreigners. (Photo by STR / AFP)

Sri Lankan Prime Minister Ranil Wickremasinghe (C) arrives to visit the site of a bomb attack at St. Anthony's Shrine in Kochchikade in Colombo on April 21, 2019. - A string of blasts ripped through high-end hotels and churches holding Easter services in Sri Lanka on April 21, killing at least 156 people, including 35 foreigners. (Photo by ISHARA S. KODIKARA / AFP)

Sri Lankan Prime Minister Ranil Wickremasinghe (2nd R) arrives to visit the site of a bomb attack at St. Anthony's Shrine in Kochchikade in Colombo on April 21, 2019. - A string of blasts ripped through high-end hotels and churches holding Easter services in Sri Lanka on April 21, killing at least 156 people, including 35 foreigners. (Photo by ISHARA S. KODIKARA / AFP)

An injured Sri Lankan Special Task Force (STF) member is carried by colleagues after a blast in a house, which was detonated as security forces searched the property, in the Orugodawatta area of the capital Colombo on April 21, 2019. - A string of blasts ripped through high-end hotels and churches holding Easter services in Sri Lanka on April 21, killing at least 156 people, including 35 foreigners. (Photo by ISHARA S. KODIKARA / AFP)