Police spokesman Ruwan Gunasekera said the death toll had risen to 359 from 321 overnight
Sri Lankan President Maithripala Sirisena has asked the police chief and defence secretary to quit following the Easter Sunday suicide bomb attacks on churches and luxury hotels that killed 359 people, two sources close to the president said on Wednesday.
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.
Sri Lankan police said on Wednesday they had detained 18 more people for questioning over the Easter Sunday attacks on churches and hotels, claimed by the Islamic State group, as the death toll climbed again to 359.
The extremist Islamic State group made its claim after Sri Lankan officials said the suicide bombings in Sri Lanka were carried out in retaliation for attacks on two mosques in New Zealand that killed 50 people in March.
Police spokesman Ruwan Gunasekera said the death toll had risen to 359 from 321 overnight, with about 500 people wounded, but did not give a breakdown of casualties from the three churches and four hotels hit by the bombers.
Islamic State said through its AMAQ news agency the assaults in Sri Lanka were carried out by seven attackers but gave no evidence to support its claim of responsibility. If true, it would be one of the worst attacks carried out by the group outside Iraq and Syria.