Detectives hunting for the killer of a pregnant woman stabbed to death in Co Armagh three weeks ago, have seized a car for examination.

Thirty-two-year-old Natalie McNally was 15 weeks' pregnant with a baby boy when she was murdered in her Lurgan home.

This afternoon the PSNI said officers had seized a car in the Lisburn/Castlereagh area and taken it away for tests.

They also carried out door-to-door inquiries in the same area.

Tomorrow the murder investigation team will return to the scene of the killing at Silverwood Green in Lurgan.

Detective Chief Inspector Neil McGuinness said they hoped to jog memories of people living nearby, which might provide information to help them catch the killer.

"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.

"Amidst their pain, Natalie's devoted family have somehow found the strength to appeal publicly for anyone with information to do the right thing and speak up", he said.

Some CCTV footage has been released of the main suspect, a man seen walking into Ms McNally's street and leaving again just over 30 minutes later.

The murder happened on Sunday, 18 December - the same night as the World Cup Final.

A £20,000 reward has been offered by independent charity Crimestoppers for information leading to the arrest and conviction of Natalie McNally's killer.