The suspected female accomplice of Islamists behind attacks in Paris left France last week and travelled to Syria via Turkey, a source familiar with the situation said.
French police have been searching for 26-year-old old Hayat Boumeddiene.
She is believed to be the partner of a man who killed a police woman and four people at a Jewish supermarket yesterday.
A Turkish source has said that she entered Turkey on 2 January.
She was believed to have moved on to the southeastern Turkish city of Sanliurfa and then to Syria but there was "no concrete data" to prove it.
The source said Turkey did not arrest her because of a lack of intelligence from France. "We do not have the luxury to prevent everyone entering without intelligence sharing," the source said.
Meanwhile, the mother and sisters of Amedy Coulibaly condemned his attacks offering their "sincere condolences" to the families of the victims.
They said: "We condemn these acts. We absolutely do not share these extreme ideas. We hope there will not be any confusion between these odious acts and the Muslim religion," they wrote.
Coulibaly was killed by police yesterday after seizing a Jewish supermarket in Paris where he shot four hostages dead.
A day earlier he had killed a policewoman in Montrouge, south of the capital.
Earlier, relatives of Ahmed Merabet, the policeman who was shot in cold blood as he tried to stop the Charlie Hebdo attackers from fleeing, paid a moving tribute today to a man they described as the "pillar" of their family.
Mr Merabet's death on Wednesday was caught on video footage that was shown on television and that his partner said she saw without even knowing what she was watching.
"Ahmed, a man of commitment," his brother Malek said, before breaking down in tears.
After a short moment, he continued: "(He) had the will to watch over his mum and his loved-ones since the death of his father 20 years ago."
"A pillar of his family, his duties did not stop him from being a protective son, a teasing brother, a doting uncle and a loving companion," he told a news conference.
Mr Merabet was killed as Cherif and Said Kouachi escaped from the Paris office of Charlie Hebdo magazine after having mowed down 11 people inside.
Fired on by the attackers, he fell to the ground injured.
One of the two brothers then ran towards him and shot him dead at point-blank range.
Meanwhile, French ministers held an emergency meeting to discuss the terror attacks in Paris over the past three days and security ahead of marches tomorrow.
17 people lost their lives in the attacks which began last Wednesday when 12 people were murdered at the offices of the satirical magazine Charlie Hebdo.
More details have emerged about the security operations that ended two separate sieges in and around Paris yesterday.
Police first stormed a warehouse north of the capital, killing two brothers, Said and Cherif Kouachi, suspected of carrying out the attack of Charlie Hebdo HQ on Wednesday in which 12 people died.
Teenager wrongly linked with Charlie Hebdo attack speaks out
Separately, teenager Mourad Hamyd wrongly linked to the attack has said: "I'm in shock, people said horrible and false things about me on social media even though I am a normal student who lives quietly with his parents," said the bespectacled teenager who one day hopes to study medicine."
"The attack was horrific and my thoughts are with the victims," he added.
It remains unclear how Hamyd, who until this week was completely unknown to the police, became linked to the magazine attack.
But as he reflected on his name appearing in news reports and online posts across the world, he said he feared the wrongful accusation would haunt him for years to come.
"I only hope this won't taint my future," he said.
"I have nothing to do with this whole thing, Cherif is just my brother-in-law with whom we have a fairly distant relationship," he said, adding that Cherif lived in the Paris region and rarely visited his northern home town.
Hamyd's sister, who is married to Cherif, was taken into custody on Wednesday and freed today.
"I am sure she is also innocent," an unnamed relative told AFP.