UAE-backed Yemen militia kidnap Saudi-appointed official in Aden
The gunmen stormed the home of Mohammed Taher, the head of the payroll committee of the Security Belt Forces - a paramilitary wing of the STC - and took him to an unknown destination, sources told Anadolu.
Taher had been appointed to his position by the Saudi-Emirati coalition as part of the implementation of the Riyadh accords, a power-sharing deal agreed between the UAE-backed separatists and the Saudi-backed government in November.
Local media reported that Taher had been taken to the headquarters of Security Belt Forces' counter-terrorism unit in the Gold Mohur area of Aden, however, this could not be verified.
In-depth: Yemen's oil-rich Shabwah province faces a dangerous power struggle
In August, trouble re-erupted on a separate front, as southern secessionists seized control of Aden, the internationally-recognised government's temporary capital.
The UAE - a key part of the Saudi-led coalition helping fight the Houthis in Yemen's main conflict arena - trained and remains close to separatist troops, signalling rifts within the Gulf powers' intervention.
In a bid to end the "civil war within a war", Saudi Arabia brokered the Riyadh accords,which stipulated the creation - within 30 days of a new 24-member cabinet with equal representation for the southerners.
However, the agreement has been difficult to implement, and was dealt a resounding blow in January when the STC withdrew from the key committee charged with implementing the agreements.