What is the impact of the Red Sea attacks?

Global supply chains face severe disruption as a result of the world's biggest shipping companies diverting journeys away from the Red Sea.

Attacks by Houthi rebels in Yemen on commercial vessels in recent weeks have resulted in many now deciding to avoid one of the world's busiest shipping lanes.

The Houthi group has declared its support for Hamas and has said it is targeting ships travelling to Israel, though it is not clear if all the ships that have been attacked were actually heading to Israel.

The Houthis have been stepping up their attacks since the start of the Israel-Hamas war in October.

The group, which is backed by Iran, has been using drones and rockets against foreign-owned vessels transporting goods through the strait of Bab al-Mandab - a 20-mile wide channel that splits Eritrea and Djibouti on the African side and Yemen on the Arabian Peninsula.

Ships usually take this route from the south to reach Egypt's Suez Canal further north.

But because of the attacks and the threat of future ones, several of the world's largest shipping firms, including Mediterranean Shipping Company and Maersk, have diverted vessels away to a much longer route around Africa's Cape of Good Hope and then up the west side of the continent.

The longer journeys will add up to 10 days to shipping times and cost companies millions of dollars.

Any ship passing through the Suez Canal to or from the Indian Ocean has to come via the strait of Bab al-Mandab and the Red Sea. About 17,000 ships and between 10-12% of global trade pass through it every year.

The Suez Canal is the quickest sea route between Asia and Europe and is particularly important in the transportation of oil and liquefied natural gas.

About nine million barrels of oil per day were shipped through the Suez Canal in the first half of 2023, according to freight analytics firm Vortexa, which was quoted by the US Energy Information Administration.

Analysts at S&P Global Market Intelligence said nearly 15% of goods imported into Europe, the Middle East and North Africa were shipped from Asia and the Gulf by sea. That includes 21.5% of refined oil and more than 13% of crude oil.

But it is not just about oil. Container ships carry all sorts of consumer goods seen in the shops including TVs, clothes, trainers and sports equipment.

Richard Meade, editor-in-chief of shipping publication Lloyd's List, told the BBC's Today programme that the amount of goods taken through the Red Sea was worth about $1 trillion annually.

It is inevitable that supply chains will be affected due to ships being diverted away from the Red Sea, but consumer goods "will face the largest impact", according to Chris Rogers, head of supply chain research at S&P Global Market Intelligence, though he does note the current disruption has occurred "during the off-peak shipping season".

Delays to products reaching shops can be expected, with container ship journeys expected to take about 10 days longer due to the Cape of Good Hope route adding about 3,500 nautical miles.

The extra distance will also cost companies more. Shipping rates have risen 4% in the past week and those costs could be passed on by businesses to customers.

However, rates still remain much lower than last year, and are far below the levels seen in 2021, when freight charges soared in line with demand as Covid restrictions were eased.

There are also fears the disruption could push up oil prices.

A rise in oil prices, a key ingredient in car fuel, can lead to higher prices at the pumps and also drive higher inflation.

Inflation, which measures the pace of price rises, has been falling in the UK and is currently 4.6%.

Is moving freight by sea the only option? Mr Rogers says transporting goods by rail instead would require "crossing Russia", which is under economic sanctions due to invading Ukraine, while "trucking from the Gulf to Israel may only offset around 3% of shipping".

The attacks have led the US to launch an international naval operation to protect ships in the Red Sea route, and countries including the UK, Canada, France, Bahrain, Norway and Spain have joined.

US defence secretary Lloyd Austin held a virtual meeting with ministers from more than 40 countries on Tuesday, and called on more nations to contribute to efforts to keep shipping safe in the region.