Four key takeaways on the US government response to the pipeline ransomware attack

Senior cybersecurity officials testified before a key Senate committee on Tuesday after one of the nation's largest pipeline operators was hit by an ongoing major ransomware attack that forced the company to shut down operations.

CNN has learned that federal agencies and private cybersecurity firms are investigating the attack on Colonial Pipeline but lawmakers made clear that the incident only adds to their broader concerns about hackers who are increasingly exploiting vulnerabilities in US infrastructure. Here are some key takeaways from the hearing and CNN's reporting on the government's response to the Colonial Pipeline ransomware attack.