Doubt has been cast over reports that pirates have hijacked a Panamanian-flagged chemical tanker in Somalian waters.

The 8,143-dwt Aegean II (built 1994) was believed to have been raided on Tuesday by six pirates after the ship developed mechanical issues, maritime security consultancy Dryad Global said.

The tanker was reportedly on a voyage from the UAE to Mogadishu when it was attacked roughly 333km southwest of the Yemeni island of Socotra.