James Allen arrest: People urged to check on neighbours
Anyone with relatives and friends who might have come into contact with a double murder suspect has been urged to check on them.
Detectives made the appeal after the arrest of James Allen, 36, in Leeds, after a hunt by three police forces.
Temporary Det Ch Supt Gordon Lang also praised "excellent" work by an off-duty officer that led to Mr Allen's arrest.
Mr Allen is being held after the deaths of Colin Dunford, 81, in Middlesbrough and Julie Davison, 50, in Whitby.
Speaking at a news conference, Det Ch Supt Lang, of Cleveland Police, said there was no information Mr Allen may have committed other offences.
"Please check on people - friends, relatives - and let's make sure everybody's OK," he said.
"In this inquiry we're investigating two deaths. Without a doubt, this is a dangerous man so I think it's prudent to ensure everybody's safe and well."
Police are also calling on members of the public who find any discarded clothing or footwear in the Whitby and Scarborough area to contact them.
Det Ch Insp Smith, of North Yorkshire Police said: "We are appealing to members of the public in the area to check their bins, gardens and outbuildings for any discarded personal items including footwear and clothing, and for signs of anyone living rough."
Mr Allen was arrested at about 07:30 BST, after the off-duty officer saw a man fitting his description in south Leeds.
Officers are still trying to piece together his movements while he was on the run.
Det Ch Supt Lang said he wanted to hear of any sightings of Mr Allen before his arrest in a bid to find out where he went and who he was with.
He would not comment on whether police believe Mr Allen was helped.
Mr Dunford, who was last seen alive at around 17:00 BST last Sunday, had suffered serious head injuries as a result of a significant assault, according to a post-mortem examination.
He was found dead at his terrace house in Leven Street, Middlesbrough, on Monday.
Detectives said there was no sign of forced entry at the house.
Ms Davison, who lived alone, was found dead by her sister at her rented flat in Church Square, in Whitby, on Wednesday.
She had also suffered serious head injuries, police said.
Mr Allen, who is originally from Blackpool, is believed to have known Mr Dunford when he lived next door to him in Leven Street about a year ago, but is not thought to have known Ms Davison.