Dozens of addresses have been searched by police in Leeds as the hunt continues for a wanted man.
Craig Smith is wanted in connection with threats to kill and firearms offences.
The 47-year-old from Crossgates had been released on licence in September last year after serving part of a sentence for drugs offences and driving without insurance.
He is now wanted on recall to prison following an incident on August 20.
Today the police helicopter gave support to officers as they followed a potential lead in Potternewton.
It was the latest in a series of searches at various addresses over the past two weeks.
They included a property in Scott Hall Lane which was the scene of police activity on August 21.
Detective Chief Inspector Nicola Bryar, of West Yorkshire Police Homicide and Major Enquiry Team, said: “We have been making extensive enquiries to trace Craig Smith, and this has so far included searches of 27 addresses across Leeds.
“We have only had a very limited response to our previous public appeal for information on his whereabouts and we urgently need to trace him and arrest him.”
Smith is described as being 5ft 10ins tall and of heavy build.
He has links across Leeds and to North Yorkshire, but may be sleeping rough.
Det Chief Insp Bryar said: “We would like to hear from anyone who knows where he is or who has any information that could assist in tracing him.
“While we do not believe he presents a threat to the wider community, anyone who sees him should not approach him but should contact the police immediately on 999.
“I would also like to take this opportunity to remind people that there can be serious consequences for anyone involved in assisting an offender.”
Anyone with information is asked to contact officers on 101, quoting log 862 of August 27.
Information can also be passed to the independent charity Crimestoppers anonymously on 0800 555 111.