COLOMBO, Sri Lanka (AP) — Sri Lanka’s president has asked for the resignations of the defense secretary and the national police chief after security forces failed to act on warnings before Easter suicide bombings that killed over 350 people.

President Maithripala Sirisena’s office announced that he asked for the resignations Wednesday.

It wasn’t immediately clear who would replace them.

Sirisena said during a televised speech on Tuesday that he planned to change the head of the defense forces within 24 hours.

The Islamic State group has claimed responsibility for Sunday’s attack, which struck churches and hotels in the island nation.

A Sri Lankan official has blamed breakaway members of two obscure local extremist Muslim groups.

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