A mum reportedly set off a bomb which killed her and her three children as police raided her home after her terrorist husband killed scores of innocents during an attack in Sri Lanka.

Officers descended on the luxury apartment of killer Ilham Ahmed Ibrahim in the aftermath of the attack.

But three cops were killed when his wife, Fatima, detonated a bomb, intelligence sources have claimed.

Ilham Ibrahim, 31, and brother Imsath Ahmed Ibrahim, 33, have been identified as suicide bombers responsible for deadly attacks at the Cinnamon Grand and Shangri-La hotels in Colombo.

The men, sons of a wealthy spice trader named Mohammed Yusuf Ibrahim, simultaneously set off devices in the hotels, Firstpost reports.

(Image: MDM)

(Image: UPI / Barcroft Images)

Mr Ibrahim and his youngest son Ijas Ahmed, 30, are reportedly being questioned by police.

Another brother, Ismail, is reportedly a fugitive, but may have vital information about training camps operated in the build up to the attacks.

An Indian intelligence service source told Firstpost: “This was a cell that was inspired by the Islamic State and its message.

“It’s likely, though, that its actual operations were driven by regional networks, not the Islamic State’s central leadership.”

Near the appartment block where the husband and wife terrorists Ilham and Fatima Ibrahim lived, neighbours expressed horror at the extremists who had lived next door.

"We have lived peacefully for 10 years now," said one local, in reference to the end of the civil war with the Tamil Tigers, which claimed tens of thousands of lives here.

"Now I am worried about the children going to school."

The Daily Mail reports that a Sri Lankan source believes the jihadist brothers were part of a "family cell".

(Image: MDM)

One gave a fake name before carrying out the attack, but another gave his real name - leading investigators to the family home.

An insider involved in the investigation said: "It was a single terror cell operated by one family.

"They had the cash and the motivation. They operated the cell and it is believed they influenced their extended family."

ISIS has released a picture which it claims shows seven suicide bombers alongside the mastermind who co-ordinated the Easter Sunday atrocity in Sri Lanka.

The image was released by the Amaq news agency - Daesh's official mouthpiece - and is said to show extremist cleric Zahran Hashim, who has been identified as the man who planned the attacks.

(Image: MDM)

It later released a video which is claimed to show the killers pledging their allegiance to the terror group.

Seven fantatics have their faces covered, but the terror group earlier named the bombers as Abu Ubayda, Abu al-Mukhtar, Abu Khalil, Abu al-Bara'a, Abu Muhammad and Abu Abdullah.

The men in the picture are all seen standing in front of an ISIS flag.

The blasts killed 321 people, including eight Britons.

There were six explosions on the morning of Easter Sunday, three at churches and three at luxury hotels.

A planned fourth bombing, near the airport, failed.

The death cult has repeatedly called for assaults on churches, particularly since the New Zealand mosque attacks.

The FBI is assisting Sri Lankan authorities with their investigation of the bomb attacks over the Easter weekend on three churches and four hotels, a spokeswoman for the US law enforcement agency said on Tuesday.

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The Washington Post earlier had reported that the FBI had offered expertise to test evidence and that analysts were scouring databases for information regarding the attacks.

Sri Lanka's prime minister warned there were more explosives and militants "out there" after the Easter suicide bombings.