CNN’s Nic Robertson reports from Islamabad, Pakistan, where a second round of US-Iranian peace talks are scheduled for next week.

The closure, and new attacks on ships in the region, come as Washington and Tehran trade barbs over the terms of a potential peace deal.

CNN's Nic Robertson reports the latest, including Iranian Revolutionary Guards gunboats firing on a tanker traveling through the Strait of Hormuz on Saturday, according to an advisory from the UK Mari...