Federal investigators say crewmember fatigue played a part in a 2016 tugboat accident on the Hudson River north of New York City that left three people dead.
The 90-foot tugboat was one of three pulling a barge from Albany to New Jersey when it hit a construction barge near where workers are building the new Tappan Zee Bridge.
Three crewmembers died in the March 12 crash.
A National Transportation Safety Board report released Tuesday said "inadequate manning and the resultant crewmember fatigue" likely caused of the collision.
Investigators say crewmembers aboard the Specialist had not received more than four to five hours of uninterrupted sleep in the last three days prior to the accident. They were also dealing with bad weather, strong currents and restricted visibility.