A US couple of Yemeni origin were found killed Tuesday in Khour Maksar of the port city of Aden.

Almasdar Online said that the couple were killed on Monday night inside their apartment, pointing out that the circumstances of the event are still uncertain.

Local sources spelt out that the two persons, Ali Abdullah Saif Al-Aghabri and Maraim Mohammad Al-Zahri, worked as doctors in the field of cosmetic operations in Aden.

They further cited that their assets existed inside the apartment were not stolen.

Yemeni politicians have warned against calculated plans to plunge Aden and Taiz into violence with the aim of breaking down the political settlement, stressing that security situation are tense in these cities.

Insecurity and chaos acts have increased in Aden, the city which is considered among the most strategic Yemeni areas.

Al-Qaeda targeted a number of Yemeni military commanders and intelligence officers, and kidnapped foreigners from Aden.

In March, a Saudi diplomat, Abdullah al-Khalidi, was kidnapped by Al-Qaeda in Aden and its destiny is still uncertain so far.

Unidentified gunmen assassinated early of Sunday an intelligence officer, Colonel Ahmed Al-Barakani, at the intelligence office in the Al-Towahi town while he was on duty.

The gunmen opened fire at Al-Barakani inside the office and he died immediately.

Most assassinations carried out against intelligence officers have occurred in Aden, which has been experiencing alarming insecurity since the popular uprising erupted against the former regime in early 2011.