The Ministry of Muslim Religious and Cultural Affairs said the trustees and custodians have the full responsibility for the administration and management of mosques in accordance with the provisions of the Muslim Mosques and Charitable Trusts or "Wakf Act".

Alaina Teplitz, the USA ambassador to Sri Lanka, paid tribute to Chelsea Decaminada who was seriously wounded when two bombers hit the luxury Shangri-La hotel in Colombo on April 21.

Issuing a letter to the Trustees of all mosques, Minister Haleem cautioned that the Board of Trustees will be held fully responsible if hatred or extremism is promoted by any means during a gathering at mosques.

The Ministry of Muslim Religious and Cultural Affairs said mosques must not be used for radicalising congregations.

Muslim theologists and civil society organizations have warned about radicalisation of Muslims with support from mosques in some places, particularly in the island nation's eastern province.

Sri Lankan radicals who had pledged allegiance to the militant Islamic State group have been blamed for the April 21 bombings against three Christian churches and three luxury hotels.

The Sri Lankan foreign ministry had previously said 44 foreign nationals died in the attacks, while another 10 are still unaccounted for.

It said all mosques must submit copies of sermons given within their premises.

Two weeks ago, Zahran's family members committed suicide by triggering a blast at a safe house in Sainthamuruthu area of Kathankudi following a gun-battle with the security forces.