Australians have been warned of an imminent Iran-linked attack threat in central Baghdad, with the Australian government urging anyone in Iraq to avoid military and energy infrastructure, as well as locations associated with Israeli, Jewish and US interests.The alert was issued on Thursday evening for Iraq, which remains under a 'do not travel' advisory on the Smartraveller platform run by the Department of Foreign Affairs and Trade (DFAT)."On 2 April, the US Embassy in Baghdad issued a security alert advising that Iraqi militia groups aligned with Iran may intend to conduct attacks in central Baghdad in the next 24-48 hours," the update read.Those in Iraq are urged to shelter in place, remain indoors as much as possible and monitor developments closely."Stay aware of your environment and avoid government, military or energy infrastructure, including oil production facilities," the alert said US authorities have said they suspect she was taken by members of an Iranian-backed militia group.Authorities are searching the city for her, police officials say.On terrorism, the alert warned that attacks could occur at any time and in any location, with militia groups known to target hotels frequented by foreigners in the Iraqi Kurdistan Region.The International Zone in central Baghdad — a heavily fortified area in central Baghdad housing foreign embassies, government buildings and international organisations — remains closed with limited exceptions.While the Australian government has urged all Australians to leave Iraq, Smartraveller has warned those still in the country to exercise caution at checkpoints and consider any exit route carefully."Exercise extreme caution at checkpoints throughout Iraq," the update said