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Gibraltar government source denies tanker will leave on Tuesday

LONDON, Aug 13 (Reuters) - A highly placed Gibraltarian government source denied on Tuesday an Iranian news agency report which said the Iranian oil tanker Grace 1 would be leaving the British overseas territory on Tuesday.

British Royal Marines seized the tanker on July 4 off the coast of the British Mediterranean territory of Gibraltar on suspicion of violating EU sanctions by taking oil to Syria, which Tehran denies.

Iran's semi-official Fars news agency quoted unidentified Gibraltar authorities as saying the tanker would bee freed on Tuesday evening.

A senior Gibraltarian government source said that report was not correct. Earlier, Gibraltar said it was seeking to de-escalate the situation. (Reporting by Guy Faulconbridge; editing by Michael Holden)