The headless bodies of at least eleven people have been recovered from a nature reserve near the southern Yemeni coastal city of Aden, which is controlled by loyalists to the former government.

An unnamed source told the local Arabic-language al-Ghad news agency that the corpses were found at al-Hiswa reserve in Enma city, which lies nearly 14.5 kilometers northwest of Aden, on Tuesday evening.

The report added that the condition of the bodies suggested they had been dumped there more than a month ago.

No individual or militant group has claimed responsibility for the act of terror yet, and the motive remains unknown.

Aden, Yemen’s second largest city, has witnessed a surge in terror activities by al-Qaeda and Daesh-linked elements over the past year.

For more than a year, Aden has been controlled by loyalists to the administration of former Yemeni president, Abd Rabbuh Mansur Hadi, a close Saudi ally, but they have so far failed to restore order to the city.

The al-Qaeda in the Arabian Peninsula (AQAP) in Yemen has taken advantage of the chaos fueled by a deadly Saudi military campaign to tighten its grip on parts of southeast Yemen.

The Takfiri Daesh terrorist group has also gained ground in and around the main southern city of Aden after the army and their Houthi allies were evicted by the Saudi-led offensive, which has been launched in support of the former Hadi government.

Riyadh’s attacks have killed at least 11,400 people in the kingdom’s impoverished neighbor since March 2015, according to the latest tally by a Yemeni monitoring group.