SUEZ, Egypt — A giant container ship remained stuck sideways in Egypt’s Suez Canal for a fifth day Saturday, as authorities made new attempts to free the vessel and reopen a crucial waterway whose blockage is disrupting global shipping and trade.

Meanwhile, the head of the Suez Canal Authority said strong winds were “not the only cause” for the Ever Given running aground on Tuesday, appearing to push back against conflicting assessments offered by others. Lt. Gen. Osama Rabei told a news conference Saturday that an investigation was ongoing but did not rule out human or technical error.

The massive Ever Given, a Panama-flagged ship that carries cargo between Asia and Europe, got stuck in a single-lane stretch of the canal, about 3.7 miles north of the southern entrance, near the city of Suez.

Ossama Rabei

Lt. Gen. Ossama Rabei, head of the Suez Canal Authority, investigates the situation with the Ever Given, a Panama-flagged cargo ship, on Thursday, days after it become wedged across the Suez Canal and blocked traffic in the vital waterway. An operation is underway to try to work free the ship, which further imperiled global shipping Thursday as at least 150 other vessels needing to pass through the crucial waterway idled waiting for the obstruction to clear. Suez Canal Authority via Associated Press

Rabei said he could not predict when the ship might be dislodged. A Dutch salvage firm is attempting to refloat the vessel with tugboats and dredgers, taking advantage of high tides.

Rabei said he remained hopeful that dredging could free the ship without having to resort to removing its cargo, but added that “we are in a difficult situation, it’s a bad incident.”

Asked about when they expected to free the vessel and reopen the canal, he said: “I can’t say because I do not know.”

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Shoei Kisen, the company that owns the vessel, said it was considering removing containers if other refloating efforts failed.

Bernhard Schulte Shipmanagement, the Ever Given’s technical manager, said “significant progress” was made late Friday at the ship’s stern where its rudder was released from sediment, with another attempt to free the vessel to be made around midnight Saturday.

It said around a dozen tugboats were working Saturday alongside dredging operations that were removing sand and mud from around the left side of the vessel’s bow.

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The cargo ship MV Ever Given stuck in the Suez Canal near Suez, Egypt, Saturday. Maxar Technologies via AP

Some 9,000 tons of ballast water had been already removed from the vessel, the canal chairman said.

Since the blockage began, a maritime traffic jam had grown to more than 320 vessels waiting on both ends of the Suez Canal and in the Great Bitter Lake in the middle of the waterway.

Peter Berdowski, CEO of Boskalis, the salvage firm hired to extract the Ever Given, said the company hoped to pull the container ship free within days using a combination of heavy tugboats, dredging and high tides.

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He told the Dutch current affairs show Nieuwsuur on Friday night that the front of the ship is stuck in sandy clay, but the rear “has not been completely pushed into the clay and that is positive because you can use the rear end to pull it free.”

Berdowski said two large tugboats were on their way to the canal and are expected to arrive over the weekend. He said the company aims to harness the power of the tugs, dredging and tides, which he said are expected to be up to 20 inches higher Saturday.

“The combination of the (tug) boats we will have there, more ground dredged away and the high tide, we hope that will be enough to get the ship free somewhere early next week,” he said.

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A work crew using excavating equipment tries to dig out the Ever Given. Suez Canal Authority via AP

If that doesn’t work, the company will remove hundreds of containers from the front of the ship to lighten it, effectively lifting the ship to make it easier to pull free, Berdowski said.

A crane was already on its way that can lift the containers off the ship, he said.

The salvage mission was turning its focus to the ship’s lodged bow, after some progress was made towards freeing the ship’s stern, the canal service provider Leth Agencies said Saturday.

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Egypt Prime Minister Mustafa Madbouly called the ship’s predicament “a very extraordinary incident,” in his first public comments on the blockage.

The Suez Canal Authority organized the first media trip Saturday to the site where the vessel was stuck. From a distance, a flotilla of tugboats and other salvage equipment appeared minuscule compared to the vessel, mirroring the scale of mishap and efforts needed to reopen the canal.

Bernhard Schulte Shipmanagement said Friday that its initial investigation showed the vessel ran aground due to strong winds and ruled out mechanical or engine failure. However, Rabei seemed to be pushing back against that assessment Saturday, saying that all possibilities, including human and technical errors, were being investigated.

A prolonged closure of the crucial waterway would cause delays in the global shipment chain. Some 19,000 vessels passed through the canal last year, according to official figures. About 10% of world trade flows through the canal. The closure could affect oil and gas shipments to Europe from the Middle East.

Some vessels began changing course and dozens of ships were still en route to the waterway, according to the data firm Refinitiv.

It remained unclear how long the blockage would last. Even after reopening the canal that links factories in Asia to consumers in Europe, the waiting containers are likely to arrive at busy ports, forcing them to face additional delays before offloading.

Associated Press writer Mike Corder at The Hague, Netherlands, contributed to this report.

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