A timeline of the escalation in the Gulf
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A timeline of the escalation in the Gulf

Tensions have risen sharply in recent months with a string of incidents involving tankers and drones

US Marines training on the flight deck of the guided-missile destroyer USS Bainbridge, May 18, 2019, deployed in the Gulf of Arabia "to respond to contingencies and to defend US forces and interests in the region." (MCS Jason Waite/US Navy)
US Marines training on the flight deck of the guided-missile destroyer USS Bainbridge, May 18, 2019, deployed in the Gulf of Arabia "to respond to contingencies and to defend US forces and interests in the region." (MCS Jason Waite/US Navy)

Tensions in the Gulf have escalated in recent months amid a deepening standoff between Iran and the United States over Tehran’s nuclear program, with a string of incidents involving tankers and drones.

Here is a recap:

‘Credible threat’

On May 5, the United States says it is sending an aircraft carrier strike group and a bomber task force to waters near Iran in response to “indications of a credible threat by Iranian regime forces.”

The Pentagon also sends B-52 bombers to the region and, later, an amphibious assault ship and Patriot missile defense battery.

US officials do not give more details on the threats, but the move comes amid heightened tensions over Iran’s nuclear program.

A pilot speaks to a crew member by an F/A-18 fighter jet on the deck of the USS Abraham Lincoln aircraft carrier in the Arabian Sea on June 3, 2019. (AP Photo/Jon Gambrell)

Washington reimposed sanctions on Tehran last year after quitting a multilateral 2015 deal meant to control its nuclear drive.

On May 8, Iran announces it will drop certain commitments under the agreement, including increasing enriched uranium and heavy water production.

US President Donald Trump responds with new sanctions on Iran’s steel and mining sectors.

Tanker ‘sabotage’

On May 12, the United Arab Emirates says four commercial oil tankers had been targeted by “acts of sabotage” in Gulf waters off its coast.

Saudi Arabia says later two of its tankers suffered “significant damage” but no casualties or oil spill.

The other vessels were Norwegian and Emirati.

Washington and Riyadh blame Tehran, which denies involvement.

The Emirati-flagged oil tanker A. Michel, May 13, 2019, one of four ships damaged in what Gulf officials called a ‘sabotage’ attack off the coast of the United Arab Emirates. (UAE National Media Council via AP)

A UAE investigation finds later that a “state actor” was likely responsible for the attacks, probably using limpet mines, but does not specifically blame Iran.

Tankers in flames

In the early hours of June 13, two fuel-loaded tankers passing through the Strait of Hormuz towards the Indian Ocean are hit by mysterious blasts that cause major fires.

One is a Norwegian vessel and the other is Japanese-owned. Their crews are rescued.

The Strait is a vital corridor connecting the petroleum-rich states of the Middle East with markets around the world.

An oil tanker on fire in the Gulf of Oman, June 13, 2019 near the strategic Strait of Hormuz where two ships were reportedly attacked. (AP Photo/ISNA)

Washington, London and Riyadh accuse Tehran of being behind the attacks, which it denies.

Rocket attacks on Iraq

On June 18, rockets strike an oil field in Iraq’s Basra region, near a camp used by a company of US industrial conglomerate General Electric.

It is the latest in a nearly week-long barrage of anonymous shelling attacks on American interests across Iraq.

The incidents are not claimed, but largely originate from areas where Shiite-dominated armed groups loyal to Tehran have free rein.

US drone downed

On June 20, Iran’s Revolutionary Guards say they shot down a US drone which violated Iranian airspace.

The Pentagon says the drone was in international airspace and denounces an “unprovoked attack.”

Trump says he approved a retaliatory strike the next day but canceled it at the last minute.

General Amir Ali Hajizadeh (C), Iran’s Head of the Revolutionary Guard’s aerospace division, looks at debris from a downed US drone reportedly recovered within Iran’s territorial waters and put on display by the Revolutionary Guard in the capital Tehran on June 21, 2019. (Meghdad Madadi / TASNIM NEWS / AFP)

On June 24, he announces “hard-hitting” financial sanctions against Iran’s supreme leader Ayatollah Ali Khamenei and senior Iranian military leaders.

Tankers seized and searched

On July 11, Britain says three Iranian military vessels had tried the previous day to “impede the passage” of a UK oil tanker in Gulf waters but were warned off by a British warship.

Iran’s Revolutionary Guards deny there was any confrontation, but warn that US and Britain will “strongly regret” the seizure in early July of a tanker off Gibraltar, a British overseas territory in the Mediterranean.

On July 18, Iran’s Guards say they have detained a “foreign tanker” and its crew for allegedly smuggling fuel.

The tanker was seized south of the Iranian island of Larak, according to the Guards, who do not detail the name or provenance of the vessel. It is believed to be the Panamanian-flagged vessel Riah. Authorities accuse the ship of smuggling Iranian fuel.

US shoots down Iranian drone

On July 18, Trump says the US military has taken down an Iranian drone that came within 1,000 yards of one of its naval vessels in the Strait of Hormuz.

The USS Boxer “took defensive action” against the Iranian drone as it was “threatening the safety of the ship and the ship’s crew,” Trump says.

Iran denies the claim and suggests American forces may have shot down their own drone by mistake.

UK-flagged tanker seized

On July 19, Iran’s Guards seize British-flagged tanker Stena Impero in the Strait of Hormuz for “failing to respect international maritime rules.”

This undated photo issued Friday July 19, 2019, by Stena Bulk, shows the British oil tanker Stena Impero at an unknown location. (Stena Bulk via AP)

Following the seizure, UK Foreign Secretary Jeremy Hunt warns of “serious consequences” unless the situation is resolved.

Saudi to host US forces again

Tehran’s arch-foe Saudi Arabia announces that it will host US troops on its soil in a joint move with Washington to “preserve the security of the region and its stability.”

Saudi Arabia has not hosted US forces since 2003, when they withdrew following the toppling of Iraqi dictator Saddam Hussein.

Times of Israel staff contributed to this report.

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