Detectives believe the driver of a van may hold vital information about a robbery in Chorley.
They are now calling for the man, who is believed to be in his 40s and was parked in Worthy Street at the time of a robbery last Friday, to come forward.
It follows an appeal in the Guardian last week after a woman was bound, gagged and robbed at knife point by thieves who stole a large quantity of jewellery and money.
A witness has since come forward to say she saw a mid sized van parked outside the victim’s address.
The driver was on his mobile phone at the time, but detectives believe he could help identify the robbers.
Officers from Chorley CID are also keen to trace a car that was seen in the area at the time.
A Nissan Serena, in an ocean blue colour, which looks dark green, came from the direction of Worthy Street at around the same time of the incident and was seen on nearby Buchanan Street.
Det Con John Pearce said: “This was a nasty robbery where the victim was threatened with a knife and has been bound and gagged during a terrifying ordeal. I would appeal to anyone who was in the area and who may have witnessed something or who spotted the Nissan car to come forward and contact the police.
“I am also keen to speak to the man in the van who was parked outside the property at the same time as the attack.
“We have a team of officers on this investigation and would appeal to anyone with information to get in touch.”
Anyone with information is asked to ring Chorley CID on 101 or Crimestoppers anonymously 0800 555 111.