Sri Lanka's president has demanded for the resignations of the country's defence secretary and national police chief after the Easter bombings.
Maithripala Sirisena believes the personnel should quit, sources say.
The sources declined to be named due to the sensitivity of the matter amid accusations within the government of intelligence failures ahead of the attacks.
Speaking today, state minister of defence Ruwan Wijewardene said: “We (the government) have to take the responsibility. The president (Maithripala Sirisena) is planning to make some changes in the security establishments.
"Some of them (the attackers), in earlier incidents, had been taken into custody (after) small skirmishes, but nothing of this magnitude."
Mr Sirisena, 67, said during a televised speech on Tuesday he planned to change the head of the defence forces within 24 hours.
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The Easter Sunday suicide bomb attacks on churches and luxury hotels that killed 359 people.
It comes after it emerged one of the bombers studied in the UK and Australia before returning to the Indian Ocean island.
Sri Lankan officials have not named the bomber who studied in Britain or identified the university where he obtained an undergraduate degree.
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The terrorists were mostly well-educated, and from the country's middle and upper middle classes.
State Minister of Defence Ruwan Wijewardene told reporters: "We believe that one of the suicide bombers studied in the UK and later did his postgraduate studies in Australia."
Meanwhile a government minister claims top intelligence officials deliberately hid information received before the bombings, and top security officials failed to act on several warnings of possible attacks over Easter.
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Officials said there were nine suicide bombers who detonated explosives - raising the total from seven - and confirmed one of them was a woman.
ISIS has claimed responsibility for the blasts at hotels and churches, the deadliest attack ever in south Asia and likely the deadliest ever linked to the terror group.
Eight of the nine bombers have been identified, officials said on Wednesday.
Mr Sirisena has been country's president for four years.
