Dubai - ​Explosions were heard on Saturday near Iran's Kharg Island ‌in ⁠the ⁠Gulf, a key ​oil terminal, but their origin was unknown, ​the semi-official Fars news agency reported.The state-affiliated ​Nournews said ⁠there were ‌unconfirmed reports from ​local ​sources that ⁠an Iranian tanker had been targeted ​near Kharg by a ​missile fired by U.S. forces.Also read: Trump threatens US might 'hit' Iranian nuclear site Pickaxe Mountain 'very soon'A Fars correspondent on Kharg Island said ‌explosion sounds were heard from the Gulf, ​but ​no ⁠sign of smoke was seen.There was no immediate official ​announcement by Iranian authorities about the reports.