大象传媒

The US Department of Justice says it's seized much of the $4.4m ransom paid in bitcoin to the cyber-criminal Dark Side group responsible for taking the Colonial Pipeline offline last month.

Meanwhile police in Australia say they've made more than 200 arrests in a sophisticated sting operation against organised crime using a messaging app secretly developed by the FBI.

And scientists are reporting what they say is the longest sediment avalanche yet measured in action underwater off West Africa.