The incidents all occurred in the Persian Gulf on Wednesday, a day after another encounter in which a group of Iranian naval vessels with their weapons uncovered sped close to two US Navy guided-missile destroyers.
Facing accusations that it acted aggressively toward a US warship in the Persian Gulf this week, Iran has defended its actions. This comes amid reports of a series of close encounters between US and Iranian vessels that took place in the region this week.
On Tuesday, four Iranian Revolutionary Guard Corps vessels intercepted the guided-missile destroyer USS Nitze near the Strait of Hormuz. US officials described the interception as "unsafe and unprofessional."
"These were incidents that the crews deemed unsafe," Pentagon spokesman Peter Cook told reporters on Thursday.
"These are incidents that carry a risk of escalation and we don’t desire any kind of escalation. Our ships have been operating in that part of the world for years."