Several Sudanese women have been flogged as a punishment for dressing "indecently", according to a local journalist who was arrested with them.
Lubna Ahmed al-Hussein, who says she is facing 40 lashes, said she and 12 other women wearing trousers were arrested in a restaurant in the capital, Khartoum.
She told the BBC several of the women had pleaded guilty to the charges and had 10 lashes immediately.
Khartoum, unlike South Sudan, is governed by Sharia law.
Several of those punished were from the mainly Christian and animist south, Ms Hussein said.
Non-Muslims are not supposed to be subject to Islamic law, even in Khartoum and other parts of the mainly Muslim north.