| A Yemeni security forces member stands near the site of a car bomb in October |
A suicide bomber has killed at least 35 soldiers and wounded dozens at an army base in southern Yemen, officials say.
Some estimates put the death toll as high as 50, with as many as 70 injured. No-one has yet said they carried out the attack, but the city has previously been targeted by jihadist groups in the region.
In August, a suicide attack claimed by IS killed at least 60 people in the city.
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Jihadist groups such as the so-called Islamic State and al-Qaeda have taken advantage of the conflict to carve out areas of control in the south of Yemen.
The scale of the humanitarian crisis is enormous - more than three million people have left their homes, and more than half the country's population does not have a secure source of food.
Pro-government forces, backed by a Saudi-led coalition, took control of Aden in the summer of 2015.
Since then, it has suffered a string of bombings which have killed up to several dozen at once.
The United Nations estimates that 7,270 people, mostly civilians, have been killed since the conflict began.