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Three men have been arrested on suspicion of rape.
Kent Police are investigating the assault on a woman in her 20s, which is reported to have taken place in Dover during the early hours of last Friday.
Two men, aged 22 and 25, from Dover, were arrested on Sunday.
A 26-year-old man from the Dover area was taken into custody yesterday.
They have all been released on bail while the investigation continues.
A Kent Police spokesman said today: "Officers are continuing their inquiries to establish the circumstances and location of the incident.
"All parties involved are believed to be known to each other."