The death toll has risen to nearly 300 following the deadly Easter bombings in Sri Lanka, which authorities have attributed to an obscure religious extremist group. No one has yet claimed responsibility for the brutal attacks, which also left about 500 injured, but Sri Lanka officials say they were carried out by the National Thowheeth Jama’ath, a local radical Islamist group. Two dozen suspects have been arrested in connection with the attacks, which were apparently committed by suicide bombers.

The tragedy Sunday marked the country’s deadliest violence in a decade, claiming the lives of at least 290 people across the island from its capital city of Colombo in the southwest to the eastern city of Batticaloa. Churches and hotels were among the sites targeted by the terrorists in what Sri Lanka Finance Minister Mangala Samaraweera described as a “well-coordinated attempt to create murder, mayhem, and anarchy.”

“I condemn—to the utmost of my capacity—this act that has caused so much death and suffering to the people,” Malcolm Ranjith, archbishop of Colombo, said of the Easter attacks, per the Vatican News. Pope Francis also condemned the “cruel violence,” which struck at least two Catholic churches in the country. “I entrust to the Lord all those who have tragically perished,” the pope said Sunday, “and I pray for the injured and all those who suffer as a result of this tragic event.”

At least three dozen foreigners appear to have died in the attacks, including several Americans. United States officials, including President Donald Trump and Secretary of State Mike Pompeo, condemned the attack and expressed solidarity with the Sri Lankan government.

The attack, which the Times called the “largest targeted attack on South Asian Christians in recent memory,” appears to have followed an intelligence breakdown in the Sri Lanka government. Health Minister Rajitha Senaratne told reporters Monday that the chief of national intelligence had warned of coming attacks by National Thowheeth Jama’ath two weeks ago, but Prime Minister Ranil Wickremesinghe and his cabinet had not been informed of it. “We are not trying to evade responsibility but these are the facts,” the health minister said. “We were surprised to see these reports.” The attacks, the worst violence since the country’s nearly 30-year civil war ended in 2009, have triggered fears of renewed division in the country, which Wickremesinghe sought to tamp down following the bombings Sunday. “I strongly condemn the cowardly attacks on our people today,” the prime minister said in a statement. “I call upon all Sri Lankans during this tragic time to remain united and strong.”