U.S. and Iranian delegations will have separate meetings with Pakistani officials this weekend, a senior Pakistani government official told ABC News. If those meetings go well, the U.S. and Iranian delegations would then meet directly on Sunday, the official said.

The official said the Iranian delegation has arrived in Pakistan and the U.S. delegation is expected to arrive Saturday evening local time.

-ABC News’ Habi Khan

During a gaggle with reporters Friday afternoon, White House press secretary Karoline Leavitt said that while President ‌Donald Trump's special envoy Steve Witkoff and son-in-law Jared Kushner will travel to Pakistan this weekend, it's still possible for Vice President JD Vance to be dispatched, too.

“The vice president, I understand, is on standby and will be willing to dispatch to Pakistan if we feel it's a necessary use of his time,” Leavitt said.

“We hope progress will be made, and we hope that positive developments will come from this meeting, and we will see,” she added.

“The Iranians want to talk. They want to talk in person,” Leavitt said, and Trump is “always willing to give diplomacy a chance.”

-ABC News’ Nicholas Kerr, Emily Chang and Michelle Stoddart

President ‌Donald Trump's special envoy Steve Witkoff and son-in-law Jared Kushner will travel to Islamabad, Pakistan, on Saturday for another round of peace talks with Iranian officials, White House press secretary Karoline Leavitt told Fox News.

They will "engage in talks, direct talks inter-mediated by the Pakistanis, who have been incredible friends and mediators throughout this entire process, with representatives from the Iranian delegation," she said Friday. "The Iranians reached out as the president called on them to do, and asked for this in-person conversation. So the president is dispatching Steve and Jared to go hear what they have to say."

Leavitt said Vice President JD Vance will not be going but said he "remains deeply involved in this entire process, and he'll be standing by here in the United States, along with the president and the Secretary of State, Marco Rubio, and the entire national security team for updates."

When asked whether the administration had any indication that the Iranians were closer to coming to a deal, Leavitt only said "we'll see," adding that it was part of the reason for the trip by Witkoff and Kushner.

Despite the president’s rhetoric threatening to bomb Iran and his past claims that he does not need a deal, Leavitt said the U.S. has “transitioned” into a “diplomatic phase” in order to secure a deal.

-ABC News’ Nicholas Kerr, Emily Chang and Michelle Stoddart

Iranian Foreign Minister Abbas Araghchi said on social media that he's visiting Islamabad, Pakistan, Muscat, Oman, and Moscow, Russia "to closely coordinate with our partners on bilateral matters and consult on regional developments."

Cargo tracking group Vortexa told ABC News it identified 34 sanctioned or Iranian-linked ships moving in and out of the Gulf of Oman through the U.S. blockade of Iranian ports which came into effect on April 13.

Fifteen of those were inbound toward Iran, while 19 were outbound away from Iran.

Of the observed outbound movements, six of the ships were confirmed to be laden with approximately 10.7 million barrels of Iranian crude oil.

However, after Vortexa shared its data and media outlets named three of those ships, U.S. Central Command (CENTCOM) publicly refuted that the three named ships had evaded the blockade.

CENTCOM said two of those ships -- the Hero II and Hedy -- had returned to an Iranian port, and that the third -- the Dorena -- was "under the escort of a U.S. Navy destroyer in the Indian Ocean after previously attempting to violate the blockade."

It was not immediately clear whether the M/T Majestic X, which the U.S. announced Thursday it had interdicted in the Indian Ocean for carrying oil from Iran, was also one of the ships tracked as having moved through the blockade.

Vortexa said that the blockade is having some effect but, "based on observed vessel activity, flows have continued, although in a more constrained and selective environment."

TankerTrackers.com, a maritime intelligence company that tracks crude oil shipments, told ABC News that they observed nine shipments of Iranian oil pass through the U.S. blockade between April 13 and 20, one of which has been sent back to Iran.

Of the nine shipments, eight were tankers belonging to Iran's National Iranian Tanker Company and one was independently-owned.

-ABC News' Victoria Beaule and Chris Looft