What We Know About The Ransomware Attack On A Critical U.S. Pipeline

A critical pipeline that runs from refineries on the U.S. Gulf Coast to terminals as far north as New York was shut down over the weekend after being hit by a massive ransomware attack.

The company announced Monday evening that its Line 4 between Greensboro, N.C., to Woodbine, Md., was operating under manual control, although its main lines were still shut down.

In remarks Monday at the White House, President Biden said the federal government is investigating the attack. "My administration takes this very seriously," he said.

Here's what we know so far: