President Donald Trump has dismissed Iran's response to US proposals to end the war as "totally unacceptable".

Iran's semi-official Tasnim news agency said Tehran's proposal, sent via Pakistan, which has served as a mediator, included an immediate end to the war on all fronts, a halt to a US naval blockade and guarantees of no further attacks on Iran, BBC reported. 

A ceasefire meant to facilitate talks to end the war launched by the US and Israel in February has been largely observed, despite occasional exchanges of fire.