One aircraft carrier strike group is in the Arabian Sea and another is on its way to the region. Is there any connection to increasing tensions with Iran? The Pentagon says no. Iran has threatened to close the Strait of Hormuz, which is the world’s most productive oil shipping lane because of sanctions over its nuclear program. The USS Carl Vinson arrived in the Arabian Sea on Monday. A second carrier strike group, led by the aircraft carrier USS Abraham Lincoln is on its way.