Police have been granted more time to question four men arrested on suspicion of conspiracy to murder and possession of a firearm.
The men were arrested following an "incident" in Wellington Road, Rhyl, Denbighshire, on Monday.
Armed officers were called in but North Wales Police has given no further details. It had denied rumours on social media there had been a shooting.
Magistrates have given the force another 36 hours to question the men.
Det Insp Chris Bell said: "I would like to reassure the public that we have a team of dedicated specialist officers diligently working on this."