Thousands of Sri Lankans have held a protest in the nation’s capital, demanding justice for the victims of Easter Sunday bomb attacks that killed nearly 270 people.

The protesters want the government to uncover who they say are the real conspirators behind the attacks on three churches — two Catholic and one Protestant — that included simultaneous suicide bombings during Easter celebrations on April 21 2019.

Three tourist hotels were also targeted, killing 42 foreigners from 14 countries.

Thousands of people including Catholic clergy on Friday lined up for a silent protest on both sides of the main road connecting the capital, Colombo, with the country’s international airport.

Thousands of Sri Lankans held a protest in the capital on FridayThousands of Sri Lankans held a protest in the capital on Friday (Eranga Jayawardena/AP)

They blamed the government for not taking adequate measures to deliver justice for the bombings’ victims and punish those responsible.

The protesters, dressed in white and black, held hands, forming a human chain.

They displayed placards and banners reading: “Until justice is meted out, we are watching”, “No justice delivered to victims so far” and “Where is the mastermind behind the Easter Sunday attack?”

Two local Muslim groups that had pledged allegiance to the so-called Islamic State group were accused of carrying out six near-simultaneous suicide bomb attacks, targeting worshippers at Easter services in three churches and tourists having breakfast at three popular hotels.

The attacks killed 269 people and hurt some 500 more.

Officials have charged dozens of people who allegedly received weapons training and participated in indoctrination classes from the two local Islamic extremist groups accused of carrying out the attacks.

Catholic nuns participated in a silent protest marchCatholic nuns participated in a silent protest march (Eranga Jayawardena/AP)

But no one has yet been convicted or sentenced.

“Four years have gone, still no one has been punished for this brutal attack. It is really disgusting. We need to know who are the real culprits and their motives,” said Ruwan Fernando, 47, who protested on Friday.

The Catholic Church in Sri Lanka has been critical of the investigation into the bombings.

The church’s leaders have repeatedly criticised the previous and present governments for their failure to bring the culprits to justice.

A breakdown in communication caused by a rift between then-president Maithripala Sirisena and then-prime minister Ranil Wickremesinghe was blamed for the failure of authorities to act on near-specific foreign intelligence received prior to the attacks.

The duo belonged to different political parties.

Cardinal Malcolm Ranjith, second right, archbishop of Colombo, stands in silence with other religious leaders during the silent protestCardinal Malcolm Ranjith, second right, archbishop of Colombo, stands in silence with other religious leaders during the silent protest (Eranga Jayawardena/AP)

In January, Sri Lanka’s top court ruled that inaction by Mr Sirisena and four others led to the bomb attacks and ordered them to pay compensation for violating the basic rights of the victims and their families.

The Supreme Court also ordered Mr Sirisena to pay 100 million rupees (£220,206) from his personal funds.

It also ordered the police chief, two top intelligence officials and the secretary to the Ministry of Defence at the time to pay a total of 210 million rupees (£462,489).

The court’s verdict followed a case filed by relatives of the victims.

Mr Wickremesinghe became Sri Lanka’s president last year after a political crisis drove out his predecessor following months-long protests triggered by an unprecedented economic crisis.