A Greenock street has been sealed off as part of an ongoing police investigation.
It is understood officers swooped on a house in Tasker Street in the early hours of Friday morning.
The police search escalated in the Bowfarm area this afternoon with the activity stepping up.
Both detectives and uniform police were on the scene.
Witnesses reported seeing officers going door-to-door as the search spread out further in the surrounding estate.
One witness said: "There is lots of activity, the police have been here since the early hours.
"They seem to at a house in the street, but officers are going round the doors in the rest of the estate as well."
The Telegraph has contacted Police Scotland for comment.
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