The explosion took place shortly after Sri Lankan police found 87 bomb detonators at Colombo's main bus station in the capital. The alert was sent by the country's police chief Pujuth Jayasundara on April 11.
The first explosion was reported in a church located in the capital.
The two women were living in Sri Lanka and were from the same family.
Dozens of people injured in the St Anthony's blast flooded into the Colombo National Hospital by mid-morning, an official told AFP.
He also confirmed that the heads of Sri Lankan Army, Navy and Air Force have convened for an emergency meeting with Sri Lankan Prime Minister Ranil Wickremesinghe and other ministers in the cabinet.
The explosions occurred as worshipers attended Easter services, said the police.
"We do not believe these attacks were carried out by a group of people who were confined to this country", Minister of Health, Nutrition and Indigenous Medicine Rajitha Senaratne said on Monday.
Health officials report lab-confirmed measles case in York Region
They're urging people to take the proper precautions to avoid getting the disease, which is getting vaccinated from it. The #1 measles hot-spot is the state of NY , which has reported over 462 measles cases during the 2018-2019 outbreak.
At 8.45am the city was rocked by simultaneous explosions at a large Catholic church, St Anthony's Shrine, and the Shangri-La and Kingsbury hotels.
There was no immediate claim of responsibility.
In the fatal blasts, which Sri Lankan President Maithripala Sirisena called terrorist attacks, at least 35 foreigners including Chinese, American and Dutch nationals were killed in addition to the Japanese victim. "Pictures posted on social media showed blood and rubble as members of the congregation tended to wounded people strewn across pews", reports the New York Times.
Foreign Secretary Jeremy Hunt said that he was "deeply shocked" by the attacks, adding that "to target those gathered for worship on Easter Sunday is particularly wicked".
Strongly condemn the horrific terrorist attack in Sri Lanka on Easter Sunday resulting in precious lives lost & hundreds injured.
Team India vice-captain Rohit Sharma joined in saying: "Thoughts and prayers with Sri Lanka".