Detectives investigating historical allegations of child sexual exploitation have arrested 20 men.
West Yorkshire Police detained the suspects, aged between 28 and 43, during a series of pre-planned operations in Calderdale.
Officers swooped on the men between Tuesday and Thursday and are now carrying out searches at properties in Calderdale and Kirklees.
They are being held over allegations made by a woman who claimed she was sexually abused as a child between 2006 and 2009, predominantly in the Halifax area, police said.
Twenty arrested over historic child sex exploitation claims in Calderdale
Police investigating historic allegations of child sex exploitation in Calderdale have arrested 20 men as part of a pre-planned operation.
The men, all aged between 28 and 43, were arrested and a number of addresses were searched in Calderdale and two in Kirklees, following a three day policing operation this week.
All 20 suspects have been interviewed and released, two on police bail and 18 under investigation pending further enquiries.
The investigation centres on allegations made by a woman of sexual abuse committed against her as child predominantly in the Halifax area between 2006 and 2009.