Search teams are looking for a prisoner who absconded from HMP Kirkham this afternoon.
The police helicopter has been used in the hunt for the man, who is thought not to pose a threat to the public.
Police have not released any details of the prisoner.
He absconded with a fellow inmate who was quickly captured and arrested by police.
A Lancashire Police spokesman said: “We are currently actively looking for him and pursuing different lines of enquiry.
“We don’t think that he poses any threat to members of the public. and we are searching the local area.”