The state-owned, Shanghai-based firm was among several major shipping groups to pause operations in the Strait of Hormuz, a key waterway through which one-fifth of the world's oil and gas passes normally.

Tehran has said several times it was not targeting friendly nations, but transits through the Strait had nevertheless largely ground to a halt.

Iran said in a statement circulated by the International Maritime Organisation on Tuesday that "non-hostile vessels" would be granted safe passage through the waterway.

Cosco "resumed new bookings for general cargo containers for shipments" from the "Far East" to the UAE, Saudi Arabia, Bahrain, Qatar, Kuwait, and Iraq "with immediate effect", according to a company statement.

It did not mention shipments travelling in the opposite direction, from the Gulf.

"New booking arrangements and the actual carriage are subject to change due to the volatile situation in the Middle East region," it added.

Cosco, which operates one of the world's largest oil tanker fleets, announced on March 4 that it would suspend new bookings for services for routes through the Strait of Hormuz owing to the "escalating conflicts in the Middle East region and resultant restrictions on maritime traffic".