By Yusri Mohamed and Jonathan Saul

CAIRO (Reuters) -A ship that blocked the Suez Canal for almost a week in March is being held in the waterway as canal authorities pursue a $916 million compensation claim against the ship’s Japanese owner, one of the vessel’s insurers and canal sources said on Tuesday.

The Ever Given container ship, owned by Shoei Kisen, has been in a lake separating two sections of the canal since it was dislodged on March 29, as the Suez Canal Authority (SCA) conducts investigations.

Two SCA sources, who declined to be named, told Reuters a court order had been issued for the ship to be held. Negotiations over the compensation claim were still taking place, according to one of the sources.

UK Club, the protection & indemnity (P&I) insurer for the Ever Given, said the canal’s claim included $300 million for a “salvage bonus” and $300 million for “loss of reputation”.

“Despite the magnitude of the claim, which was largely unsupported, the owners and their insurers have been negotiating in good faith with the SCA,” UK Club said in a statement.

“On 12 April, a carefully considered and generous offer was made to the SCA to settle their claim. We are disappointed by the SCA’s subsequent decision to arrest the vessel today.”

Yumi Shinohara, deputy manager with owner Shoei Kisen’s fleet management department, confirmed earlier on Tuesday that the canal had made a compensation claim and that the ship had not been given clearance to leave, but gave no further details.

There was no immediate comment from the SCA, but the authority’s chairman Osama Rabie said on Egyptian TV last week that the Ever Given would not leave until the investigation was finished and compensation paid.

He said the canal had borne “great moral damage” as well as shipping fee losses and salvage operation costs. He has also said he hoped to settle matters amicably.

Results of the SCA’s investigation were expected to be announced by the end of the week, according to SCA sources.

International supply chains were thrown into disarray when the 400 meter (430 yard) Ever Given ran aground in the canal on March 23.

Specialist rescue teams took six days to free the vessel, delaying the passage of more than 400 ships and causing others to divert around Africa.

Industry sources told Reuters last week that reinsurers were set to foot most of the bill for the ship’s grounding, with payouts expected to run into hundreds of millions of dollars.

Ships typically have P&I insurance, which covers third party liability claims including environmental damage and injury. Separate hull and machinery policies cover vessels against physical damage.

One maritime lawyer said that normally the ship owner would pay an agreed security that would allow the vessel and crew to continue on their way with a court setting a final award later.

“Of course in this case, they are hoping for cash now,” he said.

(Reporting by Yusri Mohamed in Ismailia, Yuka Obayashi in Tokyo, Jonathan Saul and Kirstin Ridley in London; Writing by Aidan Lewis; Editing by Jane Merriman and Mark Potter)