Sales of Islamic bonds have slowed because of religious doubts on the credentials of the debt, forcing bankers to search for structures more compliant with the beliefs of its followers, the Financial Times reported.

Criticism of the bonds has come from scholars including Sheikh Muhammad Taqi Usmani, head of the Accounting and Auditing Organization for Islamic Financial Institutions in Bahrain, the newspaper reported, citing Hussein Hassan, head of Islamic finance at Deutsche Bank AG.

An 18-member Islamic law board of the AAOIFI will comment on the bonds, known as sukuk, next week, the report said, citing Mohamad Nedal al-Chaar, secretary-general of the organization.