Sri Lanka's former wartime defense chief, Gotabaya Rajapaksa, said on Friday he would run for president in elections this year and would stop the spread of Islamist extremism by rebuilding the intelligence service and surveilling citizens.

Gotabaya, as he is popularly known, is the younger brother of former President Mahinda Rajapaksa and the two led the country to a crushing defeat of separatist Tamil rebels a decade ago after a 26-year civil war.

More than 250 people were killed in bomb attacks on hotels and churches on Easter Sunday that the government has blamed on Islamist militants and that Islamic State has claimed responsibility for.