BEIRUT, Lebanon (AP) — The war in the Middle East raged on multiple fronts on Monday, as the U.S. and Israel pummeled military targets in Iran’s capital, Israel stepped up its campaign against Iran-backed militants in Lebanon and Iran retaliated with a drone strike that temporarily forced the closure of Dubai’s airport, a crucial hub for travelers.

Fears of a global energy crisis persisted, even as a small number of ships passed through the Strait of Hormuz, a vital waterway through which a fifth of the world’s oil is usually transported.

Iranian strikes on commercial ships in and around the strait, and even just the threat of attacks, have slowed shipping there to a trickle. That has dramatically increased the price of oil and put pressure on Washington to do something to ease the pain for consumers and the global economy.

Brent crude, the international standard, remained over $100 a barrel on Monday. U.S. President Donald Trump said he has demanded that roughly a half-dozen countries send warships to keep the Strait of Hormuz open. So far his appeals have brought no commitments.

Iranian Foreign Minister Abbas Araghchi said of the strait, “From our perspective it is open” — just not for the United States, Israel and its allies. On social media, Araghchi also rejected as “delusional” claims that Iran was looking for a negotiated end to the war. He said it was seeking neither “truce nor talks.”

Since the United States and Israel attacked Iran more than two weeks ago, Tehran has regularly fired drones and missiles at Israel, American bases in the region, and Gulf Arab countries’ energy infrastructure.

Massive explosions were heard in Beirut as Israel launched new attacks on the Lebanese capital, saying it was striking infrastructure related to the Iran-linked Hezbollah militia group. Hezbollah began firing rockets into northern Israel after U.S.-Israeli attacks on Iran began Feb. 28.

The Israeli army has issued evacuation orders for many neighborhoods in Beirut as well as southern Lebanon.

Israel’s strikes have displaced more than 1 million Lebanese — or roughly 20% of the population — from large swaths of the country’s southern region and its capital’s southern suburbs, according to the Lebanese government, which says some 850 people have been killed. Some Israeli troops have pushed into southern Lebanon, and there are fears that Israel is preparing a large-scale invasion.

In southern Lebanon, seven people were killed in Israeli airstrikes, according to authorities and news reports.

Explosions sounded in Tehran and outlying areas Monday soon after Israel’s military announced it had launched new strikes on Iran’s capital.

More details were not immediately available with information coming out of Iran severely limited by internet outages, round-the-clock airstrikes and tight restrictions on journalists.

More than 1,300 people have been killed in Iran so far, according to the Iranian Red Crescent.

Israel has carried out some 7,600 strikes on Iran so far, knocking out 85% of its air defenses and 70% of Iran’s missile launchers, military spokesman Lt. Col. Nadav Shoshani told reporters Monday.

In Israel, 12 people have been killed by Iranian missile fire. At least 13 U.S. military members have been killed.