Commercial ships came under fire and threats from Iran's military as they tried to cross the Strait of Hormuz on Saturday, security monitors said, as Iran closed the crucial trade route again

Commercial ships remain cautious about transiting the strait as tensions escalate between the U.S. and Iran again.

The day after Iran declared the vital waterway open, it reversed course, injecting new peril into navigation there.

Analysts warn shipping risks through the conduit are at their highest level yet after this weekend's vessel strike and U.S. seizure of an Iranian-linked ship.

Ship-tracking data shows 279 ships have passed through the strait and 22 have been attacked since the war on Iran began.

Crude oil prices surged Sunday, as the U.S. and Iran teetered on the brink of a renewed war after attacks on commercial ships in the Strait of Hormuz.

The vessels were forced to dock in ports throughout the Persian Gulf since the conflict broke out on Feb. 28

MSC Cruises, TUI Cruises and Celestyal Cruises all reported that their ships had safely transited the Strait of Hormuz.

Merchant vessels attempting to cross the strait on Saturday received radio messages from Iran's navy telling them they were not allowed to pass.

Two Navy guided-missile destroyers entered the Strait of Hormuz on Saturday, the first American warships to transit the strait since the U.S.-Israel offensive in Iran began on Feb. 28. USS Frank E. Peterson (DDG-121) and USS Michael Murphy (DDG-112) are now in the Persian Gulf after transiting the strait as part of the U.

Hundreds of oil tankers are stranded at the Strait of Hormuz after Iran shut the chokepoint, with crews reporting gunfire and traumatic experiences.