Meriam Ibrahim, the Sudanese Christian woman released after being sentenced to death for apostasy, has been accused of forging her documents in a bid to leave the country, according to her lawyer.
Ibrahim, 27, was detained at Khartoum airport along with her family a day after a Sudanese appeal court reversed her conviction for abandoning Islam and adultery. Her husband Daniel Wani said the family intended to leave for the US.
The lawyer Elsherif Ali told the BBC that Ibrahim is still being held at a police station in Sudan's capital.
Born to a Christian mother and a Muslim father, Ibrahim was sentenced to death by hanging under the country's strict Sharia laws after she married a Christian, Daniel Wani, in 2011.
In Sudan interfaith marriage is forbidden and, according to Islamic law, children inherit the father's religion while the mother's line is considered irrelevant.
Ibrahim claimed she was raised as a Christian and refused to renounce her faith. She was subsequently accused of renouncing Islam through her marriage and sentenced to death.
She was also sentenced to 100 lashes after being convicted of adultery, as her marriage was deemed invalid.
Ibrahim was imprisoned with her 20-month-old son, and gave birth to a baby girl while in chains.
Her case sparked global outrage with the British government calling on Sudan to release her.