US Secretary of State Rex Tillerson called on Gulf states to stay united after four countries - Bahrain, Saudi Arabia, Egypt, and the United Arab Emirates - severed ties with Qatar Monday for allegedly embracing several terrorist groups and its ties with Iran, Independent reported.

"We certainly would encourage the parties to sit down together and address these differences," Tillerson said in Sydney.

“If there’s any role that we can play in terms of helping them address those, we think it is important that the GCC (Gulf Cooperation Council) remain united.”