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The suspects, aged between 30 and 63, were detained in raids across Singapore on Sunday after the Anglo-Dutch energy giant first alerted police in August. Several of the suspects were Shell employees.
The suspects' bank accounts have also been frozen, police added.
The 11th suspect was a Singaporean who did not work for Shell. The other six are still under investigation.
The fuel was taken on at least three occasions, according to court documents seen by AFP.
On November 21, five Shell employees were alleged to have taken fuel worth nearly Sg$1.28 million.
Meanwhile, a further three Shell employees were alleged to have taken Sg$438,000 worth of fuel on January 5.
The two Vietnamese crew of the Prime South have been charged with "dishonestly receiving stolen property".
No plea was taken and the men will appear in court again later this month.
Shell said in a statement the company anticipates a "short delay in the supply operations at Bukom, but at this point we expect to continue to meet our contractual supply obligations to customers".
Singapore is one of the world's largest oil trading hubs with huge quantities of crude from the Middle East passing through the city-state before going on to East Asia, and several oil majors have local refineries.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)