Sri Lanka’s government on Wednesday acknowledged “major” lapses over its failure to prevent the horrific Easter attacks that killed more than 350 people, despite prior intelligence warnings. Overnight, security forces using newly granted powers under the country’s state of emergency arrested 18 more suspects in connection with the attack, as the toll rose to 359. Police have so far arrested 58 people, all Sri Lankans, and security remains heavy, with bomb squads carrying out several controlled explosions of suspect packages on Wednesday.