Leading Japanese cryptocurrency exchange Liquid has been hit by hackers, with almost $100m (£73m) estimated to have been stolen.
The company announced that some of its digital currency wallets have been “compromised.”
It is the second major theft of cryptocurrencies to take place in recent days.
Last week, digital token platform Poly Network was at the centre of a $600m heist.
So-called ‘warm’ or ‘hot’ digital wallets are usually based online and designed to allow users to access their cryptocurrencies more easily, while ‘cold’ wallets are offline and harder to access and therefore usually more secure.
Blockchain analytics firm Elliptic said its analysis showed that around $97m in cryptocurrencies had been taken, with Bitcoin and Ethereum tokens amongst the haul.
Liquid has said that it was tracing the movement of the stolen cryptocurrencies and working with other exchanges to freeze and recover the assets.
Founded in 2014, Liquid operates in over 100 countries and serves millions of customers around the world.
It is one of the world’s top 20 biggest cryptocurrency exchanges by daily trading volumes, according to CoinMarketCap data.