Sri Lanka officials blame Islamist group for terror attacks

Officials in Sri Lanka say they believe a local Islamist militant group is responsible for the deadly terror attacks that took place on Easter Sunday.

The country's health minister accused National Thowheed Jamath of orchestrating the attacks, which were mostly carried out by suicide bombers. He said the group probably had support from outside the country. Still, as of Monday morning, no one had claimed responsibility.

At least eight explosions in Sri Lanka left nearly 300 people dead and injured 500 others Sunday morning. The attacks killed both locals and foreigners. They marked the worst violence in the country since the end of Sri Lanka's civil war in 2009.

RELATED: Hundreds killed in Sri Lanka bombings on Easter Sunday

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Hundreds killed in Sri Lanka bombings on Easter Sunday
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Hundreds killed in Sri Lanka bombings on Easter Sunday
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ADDS DETAIL OF THE PLACE - This image made from video provided by Hiru TV shows damage inside St. Anthony's Shrine after a blast in Colombo, Sunday, April 21, 2019. Near simultaneous blasts rocked three churches and three hotels in Sri Lanka on Easter Sunday. (Hiru TV via AP)
ADDS THE DETAIL OF THE PLACE - This image made from video provided by Hiru TV shows damage inside St. Anthony's Shrine after a blast in Colombo, Sunday, April 21, 2019. Near simultaneous blasts rocked three churches and three hotels in Sri Lanka on Easter Sunday. (Hiru TV via AP)
ADDS DETAIL OF THE PLACE - This image made from video provided by Hiru TV shows damage inside St. Anthony's Shrine after a blast in Colombo, Sunday, April 21, 2019. Near simultaneous blasts rocked three churches and three hotels in Sri Lanka on Easter Sunday. (Hiru TV via AP)
ADDS THE NAME OF CHURCH - Sri Lankan Army soldiers secure the area around St. Anthony's Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. Witnesses are reporting two explosions have hit two churches in Sri Lanka on Easter Sunday, causing casualties among worshippers. (AP Photo/Eranga Jayawardena)
Sri Lankan army soldiers secure the area around St. Anthony's Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred people were killed and hundreds more hospitalized from injuries in near simultaneous blasts that rocked three churches and three luxury hotels in Sri Lanka on Easter Sunday, a security official told The Associated Press, in the biggest violence in the South Asian country since its civil war ended a decade ago. (AP Photo/ Rohan Karunarathne )
Sri Lankan Army soldiers secure the area around St. Anthony's Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. Witnesses are reporting two explosions have hit two churches in Sri Lanka on Easter Sunday, causing casualties among worshippers. (AP Photo/Eranga Jayawardena)
ADDS THE NAME OF CHURCH - Sri Lankan Army soldiers secure the area around St. Anthony's Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. Witnesses are reporting two explosions have hit two churches in Sri Lanka on Easter Sunday, causing casualties among worshippers. (AP Photo/Eranga Jayawardena)
Sri Lankan firefighters stand in the area around St. Anthony's Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. Witnesses are reporting two explosions have hit two churches in Sri Lanka on Easter Sunday, causing casualties among worshippers. (AP Photo/Eranga Jayawardena)
Sri Lankan Army soldiers secure the area around St. Anthony's Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. A Sri Lanka hospital spokesman says several blasts on Easter Sunday have killed dozens of people. (AP Photo/Eranga Jayawardena)
Sri Lankan Army soldiers secure the area around St. Anthony's Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. A Sri Lanka hospital spokesman says several blasts on Easter Sunday have killed dozens of people. (AP Photo/Eranga Jayawardena)
Sri Lankan elderly woman is helped near St. Anthony's Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. Dozens of people were killed and hundreds wounded in near simultaneous blasts that rocked three churches and three hotels in Sri Lanka on Easter Sunday, officials said. (AP Photo/Eranga Jayawardena)
Sri Lankan Army soldiers secure the area around St. Anthony's Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. A Sri Lanka hospital spokesman says several blasts on Easter Sunday have killed dozens of people. (AP Photo/Eranga Jayawardena)
Sri Lankan firefighters stand in the area around St. Anthony's Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. A Sri Lanka hospital spokesman says several blasts on Easter Sunday have killed dozens of people. (AP Photo/Eranga Jayawardena)
People gather outside St. Anthony's Shrine where a blast happened, in Colombo, Sri Lanka, Sunday, April 21, 2019. A Sri Lanka hospital spokesman says several blasts on Easter Sunday have killed dozens of people. (AP Photo/Eranga Jayawardena)
Relatives of people killed in Church blasts mourn as they wait outside mortuary of a hospital in Colombo, Sri Lanka, Sunday, April 21, 2019. Near simultaneous blasts rocked three churches and three hotels in Sri Lanka on Easter Sunday. (AP Photo/Eranga Jayawardena)
Relatives gather outside a hospital following blasts in Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred people were killed and hundreds more hospitalized from injuries in near simultaneous blasts that rocked three churches and three luxury hotels in Sri Lanka on Easter Sunday, a security official told The Associated Press, in the biggest violence in the South Asian country since its civil war ended a decade ago. (AP Photo/Eranga Jayawardena)
A relative of a blast victim grieves outside a morgue in Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred were killed and hundreds more hospitalized with injuries from eight blasts that rocked churches and hotels in and just outside of Sri Lanka's capital on Easter Sunday, officials said, the worst violence to hit the South Asian country since its civil war ended a decade ago. (AP Photo/Eranga Jayawardena)
A Sri Lankan police commando enters a house suspected to be a hideout of militants following a shoot out in Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred were killed and hundreds more hospitalized with injuries from eight blasts that rocked churches and hotels in and just outside of Sri Lanka's capital on Easter Sunday, officials said, the worst violence to hit the South Asian country since its civil war ended a decade ago. (AP Photo/Eranga Jayawardena)
Relatives of a blast victim grieve outside a morgue in Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred were killed and hundreds more hospitalized with injuries from eight blasts that rocked churches and hotels in and just outside of Sri Lanka's capital on Easter Sunday, officials said, the worst violence to hit the South Asian country since its civil war ended a decade ago. (AP Photo/Eranga Jayawardena)
Relatives of a blast victim grieve outside a morgue in Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred were killed and hundreds more hospitalized with injuries from eight blasts that rocked churches and hotels in and just outside of Sri Lanka's capital on Easter Sunday, officials said, the worst violence to hit the South Asian country since its civil war ended a decade ago. (AP Photo/Eranga Jayawardena)
A view of St. Sebastian's Church damaged in blast in Negombo, north of Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred were killed and hundreds more hospitalized with injuries from eight blasts that rocked churches and hotels in and just outside of Sri Lanka's capital on Easter Sunday, officials said, the worst violence to hit the South Asian country since its civil war ended a decade ago. (AP Photo/Chamila Karunarathne)
Sri Lankan security forces officers secure a site believed to be a hide out of the militants following a shoot out in Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred were killed and hundreds more hospitalized with injuries from eight blasts that rocked churches and hotels in and just outside of Sri Lanka's capital on Easter Sunday, officials said, the worst violence to hit the South Asian country since its civil war ended a decade ago. (AP Photo/Eranga Jayawardena)
Sri Lankan Army soldiers secure the area around St. Anthony Shrine after a blast in Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred were killed and hundreds more hospitalized with injuries from eight blasts that rocked churches and hotels in and just outside of Sri Lanka's capital on Easter Sunday, officials said, the worst violence to hit the South Asian country since its civil war ended a decade ago. (AP Photo/Chamila Karunarathne)
Sri Lankan army soldiers secure the area around St. Sebastian's Church damaged in blast in Negombo, north of Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred were killed and hundreds more hospitalized with injuries from eight blasts that rocked churches and hotels in and just outside of Sri Lanka's capital on Easter Sunday, officials said, the worst violence to hit the South Asian country since its civil war ended a decade ago. (AP Photo/Chamila Karunarathne)
Sri Lankans carry a dead body at St. Sebastian's Church damaged in blast in Negombo, north of Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred were killed and hundreds more hospitalized with injuries from eight blasts that rocked churches and hotels in and just outside of Sri Lanka's capital on Easter Sunday, officials said, the worst violence to hit the South Asian country since its civil war ended a decade ago. (AP Photo/Chamila Karunarathne)
Dead bodies of victims lie inside St. Sebastian's Church damaged in blast in Negombo, north of Colombo, Sri Lanka, Sunday, April 21, 2019. More than hundred were killed and hundreds more hospitalized with injuries from eight blasts that rocked churches and hotels in and just outside of Sri Lanka's capital on Easter Sunday, officials said, the worst violence to hit the South Asian country since its civil war ended a decade ago. (AP Photo/Chamila Karunarathne)
Relatives of a blast victim weep outside a police morgue in Colombo, Sri Lanka, Sunday, April 21, 2019. More than two hundred people were killed and hundreds more injured in eight blasts that rocked churches and hotels in and just outside Sri Lanka's capital on Easter Sunday. (AP Photo/Eranga Jayawardena)
In this Sunday, April 21, 2019, a view of St. Sebastian's Church damaged in blast in Negombo, north of Colombo, Sri Lanka. Sri Lankan authorities blame seven suicide bombers of a domestic militant group for coordinated Easter bombings that ripped through Sri Lankan churches and luxury hotels which killed and injured hundreds of people. It was Sri Lanka's deadliest violence since a devastating civil war in the South Asian island nation ended a decade ago. (AP Photo/Chamila Karunarathne, file)
In this Sunday, April 21, 2019, photo, Sri Lankans carry a dead body at St. Sebastian's Church damaged in blast in Negombo, north of Colombo, Sri Lanka. Sri Lankan authorities blame seven suicide bombers of a domestic militant group for coordinated Easter bombings that ripped through Sri Lankan churches and luxury hotels which killed and injured hundreds of people. It was Sri Lanka's deadliest violence since a devastating civil war in the South Asian island nation ended a decade ago. (AP Photo/Chamila Karunarathne, file)
Relatives cry near the coffin with the remains of 12-year Sneha Savindi, who was a victim of Easter Sunday bombing at St. Sebastian Church, after it returned home, Monday, April 22, 2019 in Negombo, Sri Lanka. Easter Sunday bombings of churches, luxury hotels and other sites was Sri Lanka's deadliest violence since a devastating civil war in the South Asian island nation ended a decade ago. (AP Photo/Gemunu Amarasinghe)
Relatives weep near the coffin with the remains of 12-year Sneha Savindi, who was a victim of Easter Sunday bombing at St. Sebastian Church, Monday, April 22, 2019 in Negombo, Sri Lanka. Easter Sunday bombings of churches, luxury hotels and other sites was Sri Lanka's deadliest violence since a devastating civil war in the South Asian island nation ended a decade ago. (AP Photo/Gemunu Amarasinghe)
A relative holds an old portrait of 12-year Sneha Savindi, who was a victim of Easter Sunday bombing at St. Sebastian Church, after the coffin returned home, Monday, April 22, 2019 in Negombo, Sri Lanka. Easter Sunday bombings of churches, luxury hotels and other sites was Sri Lanka's deadliest violence since a devastating civil war in the South Asian island nation ended a decade ago. (AP Photo/Gemunu Amarasinghe)
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The first wave of attacks happened at three Catholic churches during Easter services. Then, a second round of explosions hit three hotels. In the afternoon, two more blasts hit another hotel and a house.

Authorities say 24 people have been arrested in connection with the attacks. Sri Lanka's president has declared a nationwide state of emergency and asked for international assistance in investigating the blasts.

Sri Lanka's prime minister said the government had information before Sunday's deadly terror attacks, but that he hadn't been briefed. He said the government will investigate why no action was taken to prevent them.

Additional reporting from Newsy affiliate CNN.  

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