Protesters have said they will continue to occupy the Sri Lankan presidential and prime ministerial residences until both leaders officially resign.
President Gotabaya Rajapaksa said he would step down on 13 July, according to an announcement made by the parliament’s speaker on Saturday.
But the president has not been seen or made a public statement himself.
Military sources have told the BBC that he is currently on a Navy vessel in Sri Lankan waters.
His brother, former Prime Minister Mahinda Rajapaksa, is on a naval base in the country, the sources say.
Thousands descended on Colombo on Saturday demanding his resignation after months of protests.
The president has been blamed for the country’s economic mismanagement, which has caused shortages of food, fuel and medicine for months.