Two teenagers were involved in a three-hour stand-off with police and fire staff after climbing onto the roof of a derelict mill.
Officers had been called to the Rishton mill after reports had surfaced of three youths behaving suspiciously in the building.
As police arrived one ran off but two 17-year-olds climbed on to the roof.
The pair refused to get down and a helicopter which was already circulating nearby, on another job, was soon above them at the scene.
Fire crews used an aerial ladder to make contact with the teenagers and a negotiator also attended.
PACE inspector for Hyndburn Insp Allen Davies said the negotiator was sent up on a cherry picker to talk to the pair.
He said: "It lasted around three hours from when we initially got there just after 9am on Friday, February 17. They were refusing to come down – and shuffling back and forth.
"Thankfully, eventually, they agreed to come down on the cherry picker. They were a little embarrassed about it."
He added: "The safety of everyone was the objective as their was a high risk for anyone on the roof of that mill. We took their details once they were down but no arrests were made because no criminal offences have been identified yet."