Prime Minister Scott Morrison confirmed Australia has offered Sri Lanka assistance with the investigation into the Easter Sunday bombings.

"We have made those offers and they have been responded to and we will be assisting wherever we can in these investigations," Mr Morrison told Sunrise on Tuesday morning.

He said the hearts of Australians go out to the victims, particularly the two Australians who were killed - Manik Suriaaratchi and her 10-year-old daughter Alexendria.

"I cannot imagine what it is like for the husband to lose his wife and a 10-year-old daughter," Mr Morrison said. "His whole world has been rocked, as indeed the world has been rocked by these events, and we just have to do reach out and hold each other and hold them as Australians."

Mr Morrison said two other Australians who had been injured were recovering in hospital, but he could not rule out the possibility of more Australian victims emerging, "given the sheer scale of the attacks and the number of
Australians travelling in Sri Lanka".

On Monday, authorities found several more bombs around the country.

Eighty-seven bomb detonators were found at a bus depot in Colombo. Officials declined to say whether they were linked to the attacks.

Adding to the tension, three unexploded bombs blew up inside a van parked near one of the stricken churches as police were trying to defuse them, sending pedestrians fleeing in panic. No injuries were reported.

Earlier on Monday, A pipe bomb with 50 kilograms of explosives was found and defused late Sunday on a road to the international airport, said Air Force Group Captain Gihan Seneviratne. He said it was powerful enough to have caused damage in a 400-metre radius.

Wires

While the majority of the almost 300 victims of the Easter Sunday attack were Sri Lankan, dozens of foreigners were also killed in the bombings around Sri Lanka.

There are conflicting reports about the number of foreigners killed in the deadly attack, with some officials putting the number as high as 39

Overnight, Spain confirmed a Spanish man and woman were killed, and the US State Department has confirmed at least four US citizens are among the dead.

The confirmations come after it was revealed earlier two Australians - a woman and her 10-year-old daughter - were killed, alongside several British nationals and one Japanese citizen. Three children of a Dutch billionaire were also killed in the attack.

Sri Lankan officials also said foreign victims were from India, Portugal, China and Turkey.

Good morning and welcome to our coverage of the Easter Sunday bombings. Here's the latest:

• Several more bombs were found around Sri Lanka on Monday, and a van parked near a church that was bombed on Sunday exploded on Monday afternoon.
• Funerals have begun for the victims of the bombings which killed at least 290 people and injured 500 others.
• Officials say 24 suspects are in custody, and there are reports the attack is linked to a little-known Islamist group called National Thowheeth Jama'ath.
• Foreigners were among the dead and injured, including an Australian mother and her 10-year-old daughter, three of Dutch billionaire Anders Holch Polvsen's four children, a celebrity chef and her daughter, and a British lawyer and her two children.
• On Tuesday, Sri Lanka will hold a national day of mourning as police continue to investigate the deadly attack.

Follow us for updates throughout the day.