It took place in the immediate area of St. Anthony's Catholic church and national shrine, which was at the center of the Easter Sunday terrorist attacks. It is unclear if anybody was hurt in the explosion.
The government on Monday said that a local jihadist group - the National Thowheeth Jama'ath - was responsible for the massacres.
Hampstead and Kilburn MP Tulip Siddiq said she had lost a relative in the attacks, while Foreign Secretary Jeremy Hunt said the United Kingdom would offer Sri Lanka support in the days to come.
The Sri Lanka military, police force, search and rescue units, and the fire department took part in the exercise and learned techniques developed in Israel to deal with large-scale attacks and natural disasters.
Forty-five children have died in the terror attack in Sri Lanka, it has today been confirmed.
De Bruyne ruled out of derby through injury
He came off injured in the second half though, and that's an injury to keep an eye on. "They're bright. We prepare for their strong points and weak points". "It's significant because it's a derby".
"ISIS very likely will continue to pursue external attacks ... against regional and Western adversaries", the U.S. Director of National Intelligence, Dan Coats, warned in a January report.
A Rockingham medical executive and her husband have been named among those killed in the Sri Lanka terrorist attacks.
The attacks were the worst ever against Sri Lanka's small Christian minority, who make up just seven percent of the 21 million population.
Another bomb exploded on a street near a church in Colombo on Monday.
Denmark's richest man Anders Holch Povlsen and his wife lost three of their four children in the attacks, a spokesman for his fashion firm said.
The bombings hit churches in Kochchikade, Negombo and Batticaloa cities, as well as the Kingsbury, Cinnamon Grand and Shangri La hotels.
After eight devastating explosions ripped through hotels and churches across the country, an improvised pipe bomb found on Sunday evening was destroyed by security services at Colombo airport.