FIVE homes in Preston were raided as part of a six month probe into a crime gang which was launched after a gun was fired in a residential street.
The raids come after an incident on December 14 last year at Kempton Rise, Blackburn, where a firearm was fired.
Although no one was injured by the firearm, a team of detectives was set up to investigate.
A 24-year-old man from Watling Street Road is being quizzed, along with a 28-year-old man from Albert Terrace, Deepdale, a 23-year-old from Garstang Road, a 32-year-old from Blackpool Road, and a 34-year-old man from Ashworth Grove.
Warrants were also carried out at other addresses in Blackburn and Sheffield.
Detective Inspector Mark Vaughton from Blackburn CID said: “While incidents of this kind are rare, I would like to reassure the residents of Lancashire, particularly Blackburn, where this disorder took place, that we will not tolerate this type of behaviour.
“This incident took place on a public residential street, instilling fear in the local residents and I am thankful that no one was hurt when the gun was let off.
“We need the public to continue to work with us to help us tackle crime by informing us of any suspicious activity, especially if they have any information at all about this incident that happened on December 14th last year.”
Any members of the public with information regarding the incident are asked to contact Lancashire Police on 101 quoting reference number LC-20131214-1488 or Crimestoppers on 0800 555 111.