Tug boats and diggers are working to free a giant container ship stuck in the Suez Canal after it veered off course in a sandstorm, officials said.

The incident has created huge tailbacks on one of the world's busiest trade routes.

Egypt's Suez Canal Authority said it was doing all it could to refloat the Taiwan-run but Panama-flagged MV Ever Given.

The 400-metre long and 59-metre wide vessel is lodged at an angle across the waterway.

Historic sections of the canal have been reopened in a bid to ease the bottleneck of backed up marine traffic.

"The container accidentally ran aground after a suspected gust of wind hit it," said ship operator Evergreen Marine Corp.

The SCA said the ship was caught up in a sandstorm, a common occurence in Egypt's Sinai desert at this time of year, blotting out light and limiting the captain's ability to see.

It was "mainly due to the lack of visibility due to the weather conditions when winds reached 40 knots, which affected the control" of the ship, the SCA said in a statement.

Shipping monitors MarineTraffic recorded that the vessel had been in the same position since at least yesterday afternoon.

SCA chairman Admiral Osama Rabie said in a statement that "rescue and tug units are continuing their efforts" to free the MV Ever Given.

Bloomberg reported it had caused a build-up of more than 100 ships seeking to transit the canal.

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"There was a grounding incident," said Alok Roy, fleet director of BSM Hong Kong, the Ever Given ship manager.

What are the consequences of Suez Canal incident?

Canal officials survey the damage

Photographs released by the SCA also showed excavators onshore digging soil from the canal's bank, with the earth-moving equipment dwarfed by the giant hull towering above.

The canal, which links the Mediterranean to the Red Sea, was opened to navigation in 1869, and was expanded in 2015 to accommodate larger ships.

MarineTraffic showed a map with large clusters of vessels circling at both ends of the canal -- in the Mediterranean off Port Said, and in the north of the Red Sea.

In the canal itself, the map showed at least six tug boats near the stuck Ever Given.

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Instagram user Julianne Cona posted a photo of the grounded ship from the Maersk Denver, which was forced to wait behind the Ever Given.

"Ship in front of us ran aground while going through the canal and is now stuck sideways," she wrote. 

"Looks like we might be here for a little bit."

Shipping website Vessel Finder said the ship was bound for Rotterdam in the Netherlands, and it was unclear why the vessel had stopped moving.

"Tug boats are currently trying to re-float the vessel," said Leth Agencies, which provides crossing services to clients using the canal.

Shipping website Vessel Finder shows the position of the container vessel

The Suez Canal is one of the world's most important trade routes, providing passage for 10 percent of all international maritime trade.

The journey between ports in the Gulf and London, for example, is roughly halved by going through the Suez, compared to the alternate route via the southern tip of Africa.

Nearly 19,000 ships passed through it last year carrying more than one billion tonnes of cargo, according to the Suez Canal Authority (SCA).

It has been a boon for Egypt's struggling economy in recent years, with the country earning $5.61 billion in revenues from the canal in 2020.

President Abdel Fattah al-Sisi announced plans in 2015 for an expansion designed to reduce waiting times and double the number of ships using the canal daily by 2023.

In February, Mr Sisi ordered his cabinet to adopt a "flexible marketing policy" for the canal in order to cope with the economic downturn caused by the Covid-19 pandemic.

Container ships account for more than half of the canal's total traffic, with some of them being among the largest in the world reaching a capacity of up to 23,000 TEU (twenty-foot equivalent unit).

Most of the cargo travelling from the Gulf to Western Europe is oil.

In the opposite direction, it is mostly manufactured goods and grain from Europe and North America headed to the Far East and Asia.