CRI听力:Yemen Crisis: Fighting Intensifies in Aden

Over 50 people have been killed over the past 24-hours in intensified fighting in Yemen between the Houthi rebels and pro-government fighters in the port city of Aden.

Explosions have been rattling homes in the suburbs of Aden, which is one of exiled Yemeni President Abd Rabbo Man?ur Hadi's last strongholds.

Saudi air strikes have been targeting Shiite-Houthi rebels for almost two weeks.

At the same time, humanitarian aid flights meant to carry medical supplies into Yemen are being held back because of logistical problems.

The Red Cross says it's been unable to find a cargo plane to ship some 48 tonnes of medical supplies into the country.

The Red Cross is also calling for a 24-hour ceasefire in Aden.

Russia has also been pressing the UN Security Council to support calls for a "humanitarian pause" in the air strikes.

However, the Saudi side is suggesting there will be no let-up for the time being.

Brigadier General Ahmed Asseri speaks on behalf of the Saudi-led coalition.

"At the moment, Aden is being targeted for the most part by campaigns coming in from Dale'a, Shabwah and Hodaydah. There is consistent support to the coalition strikes from tribes in and around Aden. The air strikes are ongoing and the objectives are clear. At the moment these militias have one of two choices: they remain within their military camps, in this manner they would fall under the air strikes, or they can go out towards Aden, then again they will become a clear target for the coalition forces air strikes."

Abd Rabbo Mansour Hadi was forced to flee Yemen two weeks ago, as the Houthi's advanced on Aden.

They are supported by troops loyal to former President Ali Abdullah Saleh, who was ousted in the Arab Spring protests.