Detectives investigating the murder of Natalie McNally seized a car yesterday.
The vehicle was taken from in the Lisburn and Castlereagh area near Belfast.
Officers also carried out house-to-house inquiries in the area.
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Ms McNally, 32, who was 15 weeks pregnant, was stabbed in her home in the Silverwood Green area of Lurgan, Co Armagh, on December 18.
Police have made two arrests but no one has been charged.
A 32-year-old man arrested on December 19 was released unconditionally and is no longer a suspect. A second man detained on December 21, also 32, has been released on police bail for further inquiries.
Detectives say the main line of inquiry was that Ms McNally was killed by someone she knew.
They do not think there is a risk to other women in the area.
On Friday, officers searched areas close to Silverwood Green. They also went to a business property in the area.
Yesterday, Detective Chief Insp Neil McGuinness, leading the investigation, said officers will revisit the murder scene today in a bid to encourage people to come forward.
He added: “[Today] will mark three weeks since Natalie, who was 15 weeks pregnant, was brutally murdered in her home.
“Our officers will be revisiting the scene. We will be speaking with motorists and pedestrians in a determined attempt to jog memories.
“This is just one part of an extensive investigation, in which we’ve already carried out hundreds of house-to-house inquiries and seized over 3,000 hours of CCTV footage.
“We have released CCTV footage for all to see., We remain absolutely steadfast in our determination to bring the killer to justice.”
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