Hours before departing Baltimore and striking a bridge support causing a catastrophic collapse, the massive container ship Dali experienced apparent electrical problems, a source told The Associated Press. This revelation comes as the FBI has boarded the vessel to conduct a criminal investigation focused on whether negligence occurred in the ship’s crew failing to address known issues before setting sail.

The Dali lost power shortly after leaving port on March 26 bound for Sri Lanka. It then struck a support of the Francis Scott Key Bridge, sending the span crashing into the Patapsco River and killing six construction workers. Two bodies remain missing as recovery efforts continue.

According to the source, alarms sounded on some of the Dali’s refrigerated containers before departure, indicating electrical inconsistencies. Officials have said the investigation will examine if the ship had power problems beforehand, evident in videos showing its lights flickering moments before impact.

The FBI is now pursuing a criminal probe into the circumstances leading up to the deadly bridge strike to determine if all federal laws were followed.

“FBI agents were aboard the cargo ship on Monday conducting court-authorized law enforcement activity,” an agency statement said, confirming the probe first reported by The Washington Post.

Meanwhile, Baltimore’s mayor announced partnerships with law firms to “launch legal action” and hold “wrongdoers responsible,” saying the city must act quickly to protect its interests.

The ship’s owner and operator, Singapore-based companies Grace Ocean and Synergy Marine, have already filed to limit their liability to $43.6 million under an 1851 maritime law provision. But attorneys for victims argue this “archaic law” unfairly protects the companies’ assets from grieving families.

As investigations by multiple agencies continue, scrutiny intensifies on what the Dali’s crew knew about any electrical issues before the disastrous bridge strike.