The European Central Bank said on Thursday its website had been hacked and some email addresses and other contact information stolen but insisted no market-sensitive data were affected. The hackers broke into a database storing details of people who had registered for ECB conferences, visits and other events, the bank said. No internal systems or market sensitive data were compromised, the ECB said in a statement. The ECB is currently running a particularly sensitive review of the euro zones top lenders, collecting streams of data to gauge whether banks have valued loans and other assets correctly, before it starts supervising them.