Iran's Revolutionary Guards are carrying out drills on the country's southern shores of the Gulf, state media said Tuesday, amid a huge buildup of US military forces in the region.
The drills come as the US mounts its biggest deployment of air and naval power in the region since the 2003 invasion of Iraq.
The Trump administration has threatened to launch a major attack on Iran if it does not dismantle its nuclear programme and has mounted one of the largest military buildups in the region since the 2003 invasion of Iraq.
Lebanon's foreign minister on Tuesday warned that Israel could attack its civilian infrastructure if tensions continue to escalate.
Two Lebanese security officials told Reuters that Israel has threatened to launch a huge attack on the country should Hezbollah intervene in any conflict.
This comes after Trump on Monday denied reports of divisions in his administration over a potential attack on Iran, calling them "100 percent incorrect".
Several US outlets had published reports suggesting opposition in the Pentagon - including Trump's top general - to an attack.