The FBI has opened a criminal investigation on the container ship that took down Baltimore’s Francis Scott Key Bridge last month, looking to determine if the ship’s crew left the port knowing the vessel was troubled.

Officials are reviewing the events that led up to the Dali container ship colliding with one of the key bridge’s support pillars, two US officials with knowledge of the matter told the Washington Post.

“The FBI is present aboard the cargo ship Dali conducting court authorized law enforcement activity,” the agency said in a statement Monday morning.

The FBI did not comment further on their investigation