DOHA: Explosions were heard over Qatar's capital Doha on Monday, a Reuters witness reported, shortly after a Western diplomat said there had been a credible Iranian threat against the US-run Al Udeid air base in the Gulf Arab state since midday. The diplomat spoke soon after Qatar announced it had closed its airspace temporarily to ensure the safety of residents and visitors. Earlier, the US embassy in Qatar had advised Americans to shelter in place, out of what it said was "an abundance of caution".

Iran has issued threats to retaliate against the United States after US bombers dropped 30,000-pound bunker-busters on the country's underground nuclear installations over the weekend, while President Donald Trump openly raised the possibility of the Iranian government being toppled. Earlier on Monday, Israel struck a jail for political prisoners in Tehran in a potent demonstration that it was expanding its targets beyond military and nuclear sites to aim squarely at the pillars of Iran's ruling system.

Two US officials said Washington assessed that Iran could carry out attacks targeting American forces in the Middle East soon, although the US is still seeking a diplomatic resolution that would see Tehran forgo any reprisal. Despite Iran's threats to challenge oil shipments from the Gulf, oil prices largely held steady LCOc1, suggesting traders doubted the Islamic Republic would follow through on any action that would disrupt global supplies. Iranian Foreign Minister Abbas Araqchi met Russian President Vladimir Putin in Moscow as Tehran sought backing from one of its last major power friends for its next steps. — Reuters