<span style="color: #222222;">US President Donald Trump has dismissed Iran's insistence it had no involvement with the attacks on two oil tankers in the Gulf of Oman. </span><br />'' <br />'' <span style="color: #222222;">Mr Trump cited footage that Washington says shows Iranian forces in a small boat taking an unexploded mine off the hull of one of the ships. </span><br />'' <br />'' <span style="color: #222222;">The blasts came a month after four oil tankers were damaged in an attack off the coast of the United Arab Emirates. The US blamed Iran for that attack but did not produce evidence. Iran also denied those accusations.<br />'' <br />'' Meanwhile, Iranian President Hassan Rouhani yesterday accused the US of posing a serious threat to stability in the Middle East, without referring directly to the attacks in the Gulf of Oman. </span><br />'' <br />'' <span style="color: #222222;">He reiterated a call for international parties to the 2015 nuclear deal to honour their commitments, following a unilateral withdrawal by the Trump administration.<br />'' <br />''<br />''Iranian Foreign Minister Javad Zarif on Twitter accused the US of making an allegation without a shred of factual or circumstantial evidence and attempting to sabotage diplomacy. </span>