The Iranian response was sent via Pakistan on Sunday, state media said.
President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israeli strikes targeting military, government and infrastructure sites.
Following the announcement of a two-week ceasefire, initial U.S.-Iran talks in Pakistan in April failed to reach a peace deal.
Trump later announced the open-ended extension of the ceasefire and the continuation of a U.S. blockade until negotiations are concluded "one way or the other."
The U.S. Central Command said it redirected 58 commercial vessels and disabled four since April 13 as part of its blockade on Iran.
"The U.S. Naval blockade against Iran continues be to fully enforced," CENTCOM said in a post on X.
The United Kingdom said it is sending a destroyer, the HMS Dragon, to the Middle East in anticipation of the deployment of a future international mission in the Strait of Hormuz, AFP reported in a post on X.
The destroyer is currently in the Mediterranean, the AFP report added.
The U.K. and France said in April they were planning a "peaceful multinational mission" that would ensure safe passage for ships in the strait as a defensive measure. The two countries said it would be separate from the warring parties to the conflict and intended to be deployed as soon as circumstances permit.
On Wednesday, France deployed its carrier strike group to the Red Sea as part of planning for a potential mission to secure the Strait of Hormuz, Reuters reported.
-ABC News' Somayeh Malekian
As the U.S. awaits Iran’s response to its peace proposal, President Donald Trump said Saturday that he "expects to hear very soon" from the Iranians, according to French news outlet TF1 Info.
In an interview, Trump also told the outlet "they still very much want to conclude a deal."
President Donald Trump told reporters he was expecting to receive a response on a peace plan from Iran on Friday night but said, "We'll see what happens."
Trump made his remarks as he left the White House on Friday evening.
Asked if the U.S. had received a response from Iran, Trump said: "We're receiving a letter, supposedly tonight, but we'll see how that goes."
Trump was pressed on Iranian attacks that have persisted in Kurdish areas of Iraq amid the ceasefire, with the president saying that he was focused on getting the entire conflict in the Middle East ended.
"We want to get the whole thing ended, and we will," he said.
-ABC News' Nicholas Kerr and Michelle Stoddard
