US President Donald Trump has denied FBI reports accusing North Korea of a massive hacking attack on cryptocurrency exchange Binance, saying the United States is not sure if Pyongyang was involved. "We are looking into it now. We don't know if it is related to North Korea, but if so, then we will discuss this issue with North Korea," said the head of state, answering questions from journalists at his mansion in Mar-a-Lago (Florida) about the hacking of Binance, which could have led to losses of 6.3 billion dollars.