Colombo: The father and two brothers of Zahran Hashim, the suspected mastermind of the gruesome coordinated terror Easter Sunday blasts in Sri Lanka, were killed in Friday's overnight gun battle between troops and suspects in the eastern Ampara district, the police said on Sunday.

On Friday, at least 15 people, including six children, were killed in bomb blasts and gunfire as Sri Lankan security forces closed in on a low-slung house in the seaside Sri Lankan town of Sainthamaruthu, The Washington Post reported.