Iran live updates: Trump says more details on Iran to be announced 'in 48 hours'

Iran executed at least 56 people on national security-related charges since March 19, including 27 individuals in cases linked to nationwide protests in January, United Nations High Commissioner for Human Rights Volker Turk said in a statement on Wednesday.

More than 100 people are at risk of execution on similar charges, Turk said, adding that executions for drug-related offences are also continuing at "an alarming rate."

"Persistent lack of fair trial and due process guarantees are deeply troubling. Confessions have allegedly been obtained under torture and other ill-treatment," Turk said.

"Several executions have reportedly been carried out in public. Some have reportedly been carried out only weeks after arrest. Twelve defendants were reportedly sentenced to death following a single three-hour closed-door hearing," he added.

-ABC News' Somayeh Malekian

Eight ships crossed the Strait of Hormuz on Tuesday, down from 10 on Monday and 11 on Sunday, according to maritime intelligence firm Kpler.

Most of the crossings were ships leaving the Persian Gulf and most of the ships used the route that passes through Iranian waters.

"Maritime risk remains elevated," Kpler said in its report.

-ABC News' Victoria Beaule

Yahya Saree, the official spokesperson of the armed forces of the Houthi rebels in Yemen, claimed in a post to X on Wednesday that Houthi forces attacked a Saudi oil tanker off Yanbu, a port city on Saudi Arabia's Red Sea coast, using ballistic missiles.

Speaking to reporters on the tarmac before heading to Las Vegas, Nevada, on Tuesday night, President Donald Trump said negotiations with Iran are “moving along very nicely” and said there would be more information in 48 hours.

“We’re moving along very nicely. You’ll find out. We’ll know in 48 hours,” he said.

Asked about an Axios report that says the U.S. aims to announce an agreement on reopening the Strait of Hormuz Wednesday, Trump said this “could happen” Wednesday or Thursday.

“Could happen. Tomorrow or the next day. A lot of progress has been made,” Trump said.

-ABC News' Fritz Farrow and Emily Chang