Some months ago in August, a suicide attack claimed by IS killed at least 60 people in the city. World 'turns blind eye' to Yemen - UN Terror of life under siege in Yemen Yemen crisis: Who is fighting whom? Yemen has been in constant conflict since March 2015, as forces allied to the exiled President, Abdrabbuh Mansour Hadi, clash with the Houthi rebel movement.
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.
However, 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.