The British Foreign Office insisted that the mother of one was a genuine journalist. A spokesman said: "We have told the Taleban this and passed on information from her employer to that effect.
"We expect them to accept this information and resolve this situation as soon as possible.
"We also continue to urge them that she be treated well."
Her exact whereabouts and details of formal charges are not known. Security sources in Jalalabad said that no formal charges had been laid.
The charge of spying in Taleban-held Afghanistan carries the death penalty.
A Taleban spokesman said, at the very least, she could face charges of entering Afghanistan illegally and insulting Afghan women by wearing their dress.
A spokeswoman for the Sunday Express said Ridley's colleagues were deeply concerned by the situation and rooting for her safe and speedy return.
Paul Ashford, editorial director of Northern & Shell, publishers of the Express newspaper, flew to Pakistan's capital, Islamabad, this week.
He was accompanied by a company lawyer and would be on hand for any support she might need, the spokeswoman said.
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