By Cassell Bryan-Low

LONDON, March 11 (Reuters) - Naval drones have been used in at least two attacks on oil tankers in the Gulf region since war erupted between the U.S., Israel and Iran, according to maritime authorities and analysts, demonstrating a dangerous new threat in the key shipping lane.

The emergence of the use of explosive-laden unmanned surface vessels, which Ukraine has used with great effect in its war with Russia, comes as Iran threatens to block oil shipments from transiting the key Strait of Hormuz, the chokepoint for one-fifth of the world's oil.

The UN Security Council on Wednesday called for Iran to halt its attacks on Gulf states, in a resolution that did not mention US or Israeli strikes on Iran, prompting Tehran's ambassador to decry a "blatant misuse" of the international body.

The resolution, passed by 13 votes with two abstentions, "demands the immediate cessation of all attacks by the Islamic Republic of Iran against Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, the United Arab Emirates, and Jordan."

By Idrees Ali and Phil Stewart

WASHINGTON, March 11 (Reuters) - A strike on an Iranian girls' school that killed scores of children may be the result of U.S. use of outdated targeting data, two sources familiar with the matter told Reuters on Wednesday, providing new details about what would rank among the worst cases of civilian casualties in decades of U.S. conflicts.

Reuters first reported on Thursday that an ongoing, internal U.S. military investigation showed U.S. forces were likely responsible for the strike on the girls' school in Minab.

By Patricia Zengerle

WASHINGTON, March 11 (Reuters) - Nearly every U.S. Senate Democrat signed a letter sent to U.S. Defense Secretary Pete Hegseth on Wednesday requesting a "swift investigation" of airstrikes on a girls' school in Iran that killed scores of children and any other potential U.S. military actions causing civilian harm.

Reuters reported on March 5 that U.S. military investigators believe it is likely that U.S. forces were responsible for the strike on the school on February 28, as U.S. and Israeli forces launched attacks on Iran.

By Humeyra Pamuk and Jasper Ward

WASHINGTON, March 11 (Reuters) - President Donald Trump said on Wednesday he was not worried about Iran-backed attacks on U.S. soil, as the Federal Bureau of Investigation warned of Iranian drones potentially striking the U.S. West Coast, ABC News reported.

The U.S. and Israel carried out strikes on Iran nearly two weeks ago, launching the Gulf region into a war. Tehran has carried out retaliatory strikes in response to the U.S.-Israeli strikes that killed top Iranian officials, including the country's supreme leader.

After narrowly escaping death in her border village, Myriam Nohra is among the people in south Lebanon imploring the army for protection from the war between Israel and Hezbollah.

In Christian-majority Qlayaa, which overlooks a vast green plain separating Lebanon and Israel, hundreds of people buried their parish priest Father Pierre Rai on Wednesday, two days after he was killed by Israeli shelling while inspecting the site of an attack.

Campaigners fear Iranian authorities are intent on launching a new crackdown on opponents even under wartime conditions, after the police chief threatened to shoot protesters and treat them as enemies.

The war between the Islamic republic and the United States and Israel erupted just weeks after unprecedented protests against the clerical establishment peaked in January.

But rights groups say those demonstrations were put down in a crackdown that left thousands of people dead and tens of thousands arrested.

OSLO, March 11 (Reuters) - Norwegian police said on Wednesday they had apprehended three suspects following Sunday's bombing at the U.S. embassy in Oslo.

The powerful early morning blast from an improvised explosive device (IED) damaged the entrance to the embassy's consular section but caused no injuries, Norwegian authorities have said.

"They are suspected of a terror bombing," Police Attorney Christian Hatlo told reporters.

Attacks have targeted around 20 commercial vessels in or near the Strait of Hormuz, data analyst groups report, as the blockaded waterway becomes a front line in the Middle East war.

Iran's quest to inflict maximum pain on the global economy in retaliation for US-Israeli strikes on its territory has all but shut the narrow strait through which 20 percent of global crude and LNG normally passes.

Only a tiny fraction of the vessels that used to navigate the strategic waterway have made it through, while some have ended up in flames.

- Vessels hit -

WASHINGTON, March 11 (Reuters) - Iran has deployed about a dozen mines in the Strait of Hormuz, two sources familiar with the matter said, in a move likely to complicate the reopening of the narrow waterway, an important route for shipping oil and liquefied natural gas.

Exports of oil and LNG through the strategic chokepoint along Iran's coast have effectively been halted by the war launched 12 days ago by the United States and Israel, helping to drive a surge in world energy prices.