Kuwait has arrested several people on suspicion of involvement in the bombing of a Shi'ite Muslim mosque on Friday that killed 27 people, a security source said on Saturday.
"Numerous arrests of (people)... suspected of having ties with the suicide bomber have been made," said the source.
Militant group Islamic State claimed responsibility for the bombing, which was the Gulf Arab country's worst militant attack in years and according to the interior ministry also wounded more than 200.
Kuwaiti daily al-Qabas said state security had arrested three people suspected of being involved.
Parliament member Khalil al-Salih was at the Imam al-Sadeq Mosque in the Sawaber district in the eastern part of the Kuwaiti capital when the attack occurred.
He said worshippers were kneeling in prayer when the bomber walked in and detonated his explosives, destroying walls and the ceiling.