Tennessee Republican on tensions at the Gaza Strip; America is going to 'stand with Israel' EXCLUSIVE: Republican Sen. Marsha Blackburn said the attack that forced the shutdown of Colonial Pipeline networks should be a wake up call to federal officials, warning that "cyber is a big part of 21st century warfare," while proposing a number of measures to strengthen and protect U.S. critical infrastructure. The FBI on Monday said the ransomware gang known as "Darkside" was the group responsible for the attack over the weekend that forced the shutdown of the Colonial Pipeline networks responsible for carrying gasoline from Texas to the Northeast.