A couple who disappeared with their newborn baby may have been spotted twice at locations more than 200 miles away from where they went missing, police said.
Constance Marten, Mark Gordon and the baby have been missing since their car broke down on the M61, near Bolton, on Thursday evening.
Police have released a CCTV image believed to show Marten outside Harwich Port in Essex at 9am on Saturday.
Greater Manchester Police (GMP) said a second sighting is believed to have been in Colchester around an hour later.
The force is appealing for her to make contact and seek medical assistance amid fears that neither she nor the baby have been assessed by medical professionals.
GMP said: "Evidence suggests that Constance has very recently given birth and neither her or the baby have been assessed by medical professionals.
"With it being three days now, officers are becoming increasingly concerned for the welfare of the newborn baby which is everyone’s priority and are asking for Constance and any members of the public who have any information to reach out to ensure they are safe and well."
Gordon is described as wearing dark clothing while Marten, who has a southern accent, was wearing a burgundy coat. The baby was swaddled.
GMP’s head of public protection, Chief Superintendent Michaela Kerr, previously said: "As a mum, I would like to make a direct appeal to Constance: Constance, I know this is an exceptionally hard time for you and you are likely feeling scared, but I promise that our number one priority is the same as yours – to keep your beautiful newborn safe.
"As you know, it’s really important that both you and your baby are assessed by medical professionals as soon as possible, so please make contact with emergency services or make your way to your nearest hospital, wherever that may be."
Police have urged members of the public, not just in Bolton but across Greater Manchester and beyond, to contact emergency services if they have any information.