North Korea has stolen $2bn (£1.6bn) to fund its weapons programme using cyber-attacks, a leaked United Nations report says.

The confidential report says Pyongyang has targeted banks and crypto-currency exchanges to collect cash.

Sources confirmed to the BBC that the UN was investigating 35 cyber-attacks. It follows a string of missile launches by North Korea in recent weeks, with the country’s leader Kim Jong-un saying the launches were a warning against joint military exercises being carried out by the US and South Korea.