Armed police were called and people were evacuated from their homes in a stand-off in Ulverston.
Cumbria Police said emergency services were present overnight at a property on Dale Street in the town.
Officers were initially called out yesterday evening at around 7.34pm to a report of a man in significant distress inside a property on the street.
The man was arrested at around 10am this morning and is in custody.
Emergency services identified the presence of a potential firearm within the address and a substance, believed to be noxious, was also being intermittently released from inside the address.
Due to concerns for the safety and wellbeing of the individual and those nearby, a wider evacuation was put in place.
Chief Superintendent David Pattinson, Cumbria Constabulary, said at the time of the incident: “We appreciate that the current emergency services activity in Ulverston may cause concern for the local community.
“Assessments are ongoing and will take some time to safely carry out.
“Armed response officers remain at the scene, and a cordon remains in place to ensure the safety of those in the area.
“Those evacuated are all cared for and being accommodated with families and friends or in nearby facilities.
“We continue to thank you for your on-going support.
“We understand the disruption this incident is having in our communities, including those affected by the evacuation, road closures and those concerned for loved ones in the area.
“Members of the public are continued to ask to avoid the area and anyone with concerns should approach officers or call Cumbria Police on 101.”
