The army will continue to assist police for internal security, military spokesman Sumith Atapattu told Reuters.
The emergency gave police and military extensive powers to detain and interrogate suspects without court orders.
Almost all militants suspected to have links with the attackers have either been arrested or killed, Sirisena has previously said.
The Indian Ocean island is set to vote for a new president in an election due before Dec. 9, with political parties already having kicked off campaigning.
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