The Coast Guard and FBI are investigating after two oil tankers bound for the U.S. were hit with suspected cyberattacks last month, prompting American authorities to launch investigations into both incidents, sources told @​ABC News. @​PierreTABC reports. ▻ ↧ Coast Guard, FBI investigating after 2 oil tankers bound for US hit... U.S. authorities said there were no reports of "operational disruptions."