Aden tank
An army tank moves on a street in Yemen's southern port city of AdenReuters

Dozens of unidentified soldiers have landed at the Yemeni port city of Aden, which is reportedly under the control of forces loyal to Yemen's internationally recognised President Abd Rabbuh Mansour Hadi, despite heavy fighting and air strikes in other parts of the city in recent days.

Houthi rebels retreated from positions in the centre of Aden on 2 April after a series of air strikes were carried out by a Saudi Arabian-led coalition, which has intervened in support of the president, according to Reuters news agency.

Aden is considered to be one of the last remaining strongholds of Hadi and his supporters in the country. Having fled the capital Sana'a in Feburary, he headed straight for the southern port city where he remained until he fled the country for Saudi Arabia in late March.

Saudi Arabia allied with a number of Sunni Arab states in an attempt to halt the advance of the Shia Houthi rebels in Yemen. The Houthis, who have received funding and training from Iran, have taken over a number of Yemeni cities including the capital Sana'a.