The FBI has opened a criminal investigation into the cargo ship that slammed into the Francis Scott Key Bridge and caused it to collapse in Baltimore last month, according to two senior law enforcement officials familiar with the investigation. 

The news was first reported by The Washington Post on Monday morning. 

Federal agents boarded the 985-foot Dali early Monday with search warrants. 

The Baltimore FBI confirmed Monday that agents were on board “conducting court authorized law enforcement activity.” 

The investigation will look into the events that led up to when the ship left the port, the sources said, and a portion of inquiry involves whether there was prior crew knowledge that the vessel had potential mechanical problems that would have made it unsafe in the harbor. 

FBI agents are collecting physical evidence and data from inside the ship relating to the moments before, during and after the impact, the sources said.

The probe comes as Baltimore Mayor Brandon M. Scott announced Monday the city is taking “legal steps” to address the bridge collapse, hiring law firms “to launch legal action to hold the wrongdoers responsible and to mitigate the immediate and long-term harm caused to Baltimore City residents.”

“The City of Baltimore will take decisive action to hold responsible all entities accountable for the Key Bridge tragedy, including the owner, charterer, manager/operator, and the manufacturer of the M/V Dali, as well as any other potentially liable third parties,” the mayor said in a statement.

The Singapore-flagged cargo ship collided into a support pillar of the Francis Scott Key Bridge at 1:28 a.m. on March 26, causing the bridge to snap and tumble into the Patapsco River below. 

A livestream of the catastrophe showed cars and trucks on the bridge just before impact. 

Investigators said that the Dali’s lights suddenly shut off four minutes before flicking back on. At 1:25 a.m., dark black smoke billowed from the ship’s chimney. At 1:26 a.m., the ship appeared to turn and lights flickered again before it hit the support. 

Officials said at the time that workers were pouring concrete to fix potholes on the roadway on the bridge above where the ship was hit at the time of the crash. Two people were rescued from the river. Six were reported missing, three bodies were recovered and the other three are presumed dead. 

President Joe Biden has stressed that the government will work to rebuild the bridge as soon as possible as the Port of Baltimore is a major part of the Northeast economy, and is the busiest port for car imports and exports.

The National Transportation Safety Board is also investigating the collapse.

This is a developing story. Please check back for updates.