A senior Iranian military official has warned that renewed fighting with the US is 'likely' after President Donald Trump rejected Tehran's proposal.
The draft proposal was delivered to the US via mediator Pakistan on Thursday evening, but its contents remain unclear.
Iran's Mohammad Jafar Asadi said a 'renewed conflict between Iran and the United States is likely', citing the US's lack of commitment to agreements.
Trump had earlier expressed dissatisfaction with the proposal, saying 'At this moment I'm not satisfied with what they're offering.'
The conflict has been on hold since April 8, but Asadi's comments have cast uncertainty over the fragile truce.
The Iranian proposal reportedly included the reopening of the Strait of Hormuz and the ending of the US blockade on Iran, in exchange for talks on Tehran's nuclear programme.
However, Washington has insisted on guarantees preventing Iran from obtaining a nuclear weapon, a condition that Tehran has not met.
Trump has stated that he would 'prefer not' to resume military operations, but the US President faces a legal dispute over whether he has passed a deadline to seek congressional approval for the war.