Evaluating damage

There was no damage to the nuclear propulsion plant of the Hartford, the navy said.

Both ships were heading to port when the incident occurred, Lieutenant Nate Christensen, a navy spokesman, said.

He said the submarine was submerged at the time, but said he could give no further details because the incident is still under investigation.

Authorities are still evaluating the total damage to the vessels, but both ships are currently operating under their own power, the navy said.