An investigation is underway after a significant glitch in the mobile apps of Lloyds Bank, Halifax, and Bank of Scotland allowed some customers to view other users' transactions.

• Some customers saw financial details, including National Insurance numbers, of up to six other users.
• The incident affected customers of Lloyds Banking Group, which owns all three banks.
• The issue, which occurred on March 12, was reportedly resolved quickly, but the full extent of affected users is unclear.