A ship carrying relief supplies docked in Aden on Tuesday, the first UN vessel to reach the southern Yemeni city in four months of fighting, The Daily Mail quoted Aden governor Nayef al Bakri as saying.

"This is the first boat carrying the UN flag to dock in Aden since the war began," Bakri told reporters at the Aden refinery port.

The ship is chartered by the World Food Program (WFP), which has tried repeatedly to deliver aid to the port city in recent weeks but failed due to security reasons.

"This will be the first WFP chartered ship to reach the port in Aden," WFP spokeswoman Reem Nada said shortly before the ship entered the harbor.

Vessels sent by the United Arab Emirates managed to reach Aden in May.

A humanitarian ceasefire declared by the United Nations earlier this month failed to take hold.