Sri Lankans roamed through a ransacked presidential palace on Sunday as calm returned to the commercial capital, Colombo, a day after protesters barged into the building and forced President Gotabaya Rajapaksa to announce his resignation. Prime Minister Ranil Wickremesinghe has said he would step down to allow an all-party interim government to take over, with Rajapaksa scheduled to quit on July 13, according to the speaker.