US billionaire Warren Buffett has ruled out a foray into cryptocurrencies, warning that the Bitcoin boom will "come to a bad ending".

JP Morgan chief executive Jamie Dimon has backtracked on criticism of Bitcoin, saying he regrets calling the cryptocurrency a "fraud".

Brussels will be able to "dictate" an exodus of JP Morgan bankers from Britain to the European Union as a result of Brexit, the lender's chief executive has said.

US banking giant JP Morgan reported lower-than-expected earnings in a disappointing start to the third quarter bank reporting season.