A Sea-Tac Airport official confirmed the hackers who entered the Port of Seattle systems demanded a ransom of about $6 million.

Hackers are demanding $6 million in bitcoin from the operator of the Seattle-Tacoma International Airport for documents they stole during a cyberattack last month.

But while airport and airline officials were eventually able to regain access to their software systems, a group claiming to be behind the attack had already seized certain data that it now posted on the dark web.

The Port of Seattle did not pay, and instead spent about a week getting the airport’s systems back online. In a news release last week, the port identified the group behind the attack as Rhysida. On Wednesday,