Scotland Yard said three properties - two in Westminster and one in Barnet are being searched along with a number of cars - after two men were arrested on suspicion of terror offences.
Police said that one of the arrests in Westminster took place at a residential address and not near any major landmark.
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Mission Lifeline said it conducted the rescue in international waters and asked for a safe port.
British Transport Police said they are working to reopen the major transport hub.
According to the survey, Britain would vote Remain if a new ballot was held.