Sri Lanka’s High Court has convicted 15 men who had been charged with plotting the 2019 Easter Sunday bomb attacks that killed 270 people and injured more than 500.

Those found guilty include Naufer Moulavi, who prosecutors said masterminded the suicide bombings. Nine other men were acquitted.

The co-ordinated blasts at three churches and three luxury hotels were the deadliest in Sri Lanka since the end of its civil war in 2009. Forty-five foreigners were among the dead.

All the bombers who carried out the attacks died in the blasts. Investigators have previously blamed the bombings on Islamist extremists, and the 25 men indicted were from Sri Lanka’s Muslim minority. One died in custody.

The accused had been charged with more than 23,000 offences, including murder, conspiracy to commit terrorism and possessing firearms.

More than 2,300 people gave evidence for the prosecution.

There were also 2,076 pieces of evidence, including explosives, swords and firearms.

In the wake of the attacks, Sri Lankan authorities pointed to a “major intelligence lapse”. Its parliament heard that a tip-off from India about the attacks was not properly shared with the authorities.

In 2023, the Supreme Court ordered former president Maithripala Sirisena to pay millions in compensation to the victims of the bombings, after finding him responsible for national security failures that led to the attacks.

Last month, two former senior officials were sentenced to death for criminal negligence that led to the bombings. Death sentences are usually commuted to life in prison in Sri Lanka due to a decades-old moratorium on executions.

For years, Sri Lankans have held regular demonstrations demanding justice for the victims of the Easter attacks.

The verdict comes as a separate investigation on former intelligence chief Suresh Sallay is under way. Sallay is accused of orchestrating the bombings with Islamist extremists.

The allegations echo those aired in a 2023 documentary by British broadcaster Channel 4, which heard whistleblower testimony claiming the attacks were allowed to happen to boost the popularity of the Rajapaksa family, which long dominated Sri Lankan politics.

Sallay, who was arrested in February, denies the allegations. Former president Gotabaya Rajapaksa, who was elected months after the 2019 attacks, with a campaign of tackling Islamist extremism has also denied the allegations.

Rajapaksa, who has been banned from leaving the country, has asked the court to prevent his potential arrest in connection with the ongoing investigations.