President Trump says US Navy will begin blockade of Strait of Hormuz

The prime minister of Pakistan is asking President Donald Trump to extend the deadline he set for Iran, saying diplomatic efforts are "progressing."

"Diplomatic efforts for peaceful settlement of the ongoing war in the Middle East are progressing steadily, strongly and powerfully with the potential to lead to substantive results in near future. To allow diplomacy to run its course, I earnestly request President Trump to extend the deadline for two weeks," the prime minister said in a statement.

"Pakistan, in all sincerity, requests the Iranian brothers to open Strait of Hormuz for a corresponding period of two weeks as a goodwill gesture. We also urge all warring parties to observe a ceasefire everywhere for two weeks to allow diplomacy to achieve conclusive termination of war, in the interest of long-term peace and stability in the region," the statement continued.

While messages are being passed between the U.S. and Iran, the two sides are not close to a deal and the process should not be viewed as formal negotiations, according to a Pakistani Security official familiar with the talks.

Iranian-affiliated cyber actors are targeting U.S. critical infrastructure, according to a new warning from the federal government.

Numerous agencies, including the FBI and NSA, "are urgently warning U.S. organizations of ongoing cyber exploitation of internet-connected operational technology (OT) devices, including Rockwell Automation/Allen-Bradley-manufactured programmable logic controllers (PLCs), across multiple U.S. critical infrastructure sectors," according to an alert published on Tuesday.

Multiple critical infrastructure sectors experienced disruptions, and in some cases "this activity has resulted in operational disruption and financial loss," the alert said.

The Iranian-backed group has targeted government services industry, water and wastewater systems and the energy sector, according to the agencies.

Iranian-backed actors have carried out similar actions in the past, according to the government.

-ABC News' Luke Barr

Kuwait's Ministry of the Interior is urging residents to stay indoors from midnight until 6 a.m. on Wednesday as a "precautionary measure."

The ministry said the advisory is being issued "as a precautionary measure aimed at safeguarding everyone's safety, strengthening the level of prevention, and enabling security authorities to perform their duties with high efficiency."

The U.S. carried out strikes against approximately 50 military targets on Kharg Island on Tuesday that had previously been struck last month, according to a U.S. official.

In mid-March, the U.S. struck 90 military targets on the island, which is Iran’s oil transportation hub. Those 90 targets were described then as including storage bunkers for naval lines and missiles, and other military infrastructure.

The island itself is roughly the same size as Key West, Florida, or a third the size of the island of Manhattan.

-ABC News' Luis Martinez