The crew of USS Bainbridge reported that they saw an unexploded limpet mine on the side of one of the ships attacked today in the Gulf of Oman, according to a US defense official familiar with the matter.
What that means: A limpet mine is type of a mine that is attached to side of a hull using magnets.
Limpet mines were also suspected d to be used in the May attack on four oil tankers off the coast of the United Arab Emirates. The UAE concluded that a "state actor" is the most likely culprit and chemical analysis of the debris recovered in May revealed "it was highly likely that limpet mines' were deployed."
What happens now: Additional US navy ships are expected to head to the area in the coming hours for security, patrolling, helping mariners get back to port and potentially assist in arranging for tankers to be towed to port, the source said.