President of Yemen, Abd-Rabbu Mansour Hadi has ordered his forces to ceasefire immediately in interim capital Aden after fierce clashes with southern separatists.

The call came in a communique issued by Prime Minister Ahmed bin Dagher on Sunday to the commanders of government forces in the southern port city.

Yemen’s government accused southern separatists of an attempted coup on Sunday after they took over its headquarters amid fierce clashes in the city of Aden.

The fighting, which killed at least 15 people, threw war-torn Yemen into further chaos and threatened to undermine president Abedrabbo Mansour Hadi, who ordered his forces to stand down.

Security sources and residents said clashes appeared to have spread to most of the city.

The government urged the Saudi-led military coalition, which has been supporting Hadi against Iran-backed Huthi rebels who control much of the north, to intervene.