Armed police have surrounded a house on a plush suburban road in Preston.
The police helicopter has been sent to the scene as police attempt to search a house on Watling Street Road in Fulwood, in Preston.
A short time earlier two men were arrested in a van in the Black Bull Lane area by a team of police officers.
A blue police operation support van was seen close to the Plungington pub.
It is understood the current house search is linked.