Iran live updates: Trump threatens to bomb Iranian bridges, power plants

President Donald Trump is threatening to attack Iran’s critical infrastructure, writing on social media that the U.S. will bomb "ONE BRIDGE OR POWER PLANT" any time Iran "shoots at a ship in the Strait of Hormuz."

Trump made clear that this action would be in retaliation to vessels targeted in the Strait, but he did not mention any repercussions for Iran’s attacks on Gulf allies or U.S. assets in recent days. On Monday, Trump said Iran would "pay" "many times over" for killing American servicemembers, though he has not specified exactly what form such consequences would appear in.

In his post Wednesday morning, Trump’s threat included bridges and power plants near or in the highly-populated city of Tehran.

"From this point forward, any time the Islamic Republic of Iran shoots at a ship in the Strait of Hormuz, whether it be by Missile, Rocket, Drone, or any other device or weapon, the United States will bomb and destroy ONE BRIDGE OR POWER PLANT, including those located next to, or in, the Capital City of Tehran," he wrote.

Bahrain's Interior Ministry said that air raid sirens were activated in the kingdom on Wednesday.

Saudi Arabia's Civil Defense body also issued an alert warning in the eastern city of Dammam, which sits along the Persian Gulf, "to warn of a danger." The alert was lifted around 10 minutes later.

There were 13 crossings of the Strait of Hormuz on July 20 and nine on July 21, according to maritime intelligence company Kpler.

Addressing the new threats from the Houthis in the Bab el-Mandab Strait -- which sits at the southern end of the Red Sea -- Kpler said that "traffic declined sharply across both chokepoints on 21 July, with Strait of Hormuz crossings down 31% day-on-day to nine vessels and Bab el-Mandeb down 34% to 29."

Attacks in the Strait of Hormuz are "reinforcing concerns that uncertainty across both regional chokepoints could reshape routing decisions, increase freight costs and sustain higher geopolitical risk premiums for energy markets," Kpler said.

-ABC News' Victoria Beaule

Air defenses in Jordan downed eight of 10 projectiles fired by Iran on Wednesday, according to statements from the Jordanian Armed Forces.

Iran fired six missiles and four drones into Jordanian territory according to the statements. Eight of the projectiles were intercepted. Two Iranian missiles fell in remote areas.

No injuries or damage were reported, the military said.

-ABC News' Ghazi Balkiz and Othon Leyva