The Royal Navy is reported to be preparing to evacuate Britons from Libya amid escalating violence in the north African state.
Sky News reported that the survey ship HMS Enterprise is heading for the port of Tripoli and is expected to moor offshore on Sunday.
The Ministry of Defence declined to comment on the reports. An MoD spokesman said: "As the FCO (Foreign and Commonwealth Office) has made clear, the UK Government will provide assisted departure for a number of UK nationals before suspending consular operations on Monday."
"For operational reasons we will not discuss further details including whether, and in what ways, the MoD could support these efforts."
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Festival-goers have been enjoying the second day of the Glastonbury festival.