Property and casualty insurance companies, including the nation's top six firms, failed to make payouts to policyholders in more than 10,000 cases -- worth several hundred million yen -- over the past three years due to computer glitches and human error, industry sources said Wednesday.

The revelation comes on the heels of a similar scandal that rocked the life insurance industry earlier this year.

The nonlife insurers plan to publicize their findings, possibly by midmonth, and make the delayed payments, the sources said.