According to al-Mashhad al-Yemeni website, witnesses said there was an explosion after hearing clashes in al-Sheikh al-Othman area.
There have been infightings between UAE-sponsored separatists and the Saudi-backed pro-Hadi militants in Aden recently.
They are both part of the Saudi-led coalitions that, since 2015, have launched a bloody military campaign against Yemen aimed at reinstating Abd Rabbuh Mansour Hadi and crushing the Houthi Ansarullah movement.