The search for a woman who has gone missing with her two sons has been widened out to Europe, police said.
Samantha Baldwin, 42, from Newark, was last seen in Nottingham city centre on Monday and is believed to be with Louis Madge, 9, and Dylan Madge, 6.
Police said the case was being treated as abduction and confirmed Ms Baldwin did not have legal custody of the boys.
There have been several sightings and police are “open minded” over whether they had left the UK.
A 62-year-old woman and another woman, 36, both arrested on suspicion of assisting an offender have been bailed.
Supt Rich Fretwell said: “We’ve had eight sightings across the country, six of those we’ve discounted, two are still forming part of the live investigation.
“We have an all ports warning in place, that stretches over to Europe, however, there’s no indication at the moment that they have left the country, but we keep an open mind.
“We’ve had numerous sightings… and we will go wherever the inquiries take us.
“The reality is we still do not know where Samantha and the two boys are.”
Ms Baldwin has been urged to get in touch to confirm she and the boys are safe.
Detectives have been carrying out searches of properties, studied CCTV footage and used number plate recognition technology.
Ms Baldwin is described as being 5ft 7ins (1.7m) tall, of a slim build with shoulder length, highlighted blonde hair and green/blue eyes.
She has family connections in Lincolnshire and Manchester.
Louis is described as having fair hair, a fair complexion and blue eyes and Dylan has straight dark brown hair, a tanned complexion and brown eyes.
The two boys also use the surname of Taylor, police said.