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Who are Japanese criminal gangs?

Rupert Wingfield Hayes explains that Japan is cracking down on gangsters who have been taking out bank loans which they do not repay.

Japanese bank Mizuho Financial Group's management did not intentionally cover up loans to organised crime, a report has said.

However, the report made by an external panel appointed by Mizuho, said the firm was lax in cleaning them up.

BBC Tokyo correspondent Rupert Wingfield Hayes explains that senior managers realised three years ago that 200m yen ($2m; £1.28m) had been lent to Japanese criminal gangs.