A police officer and 14 other men are due to appear at Bradford and Keighley Magistrates’ Court on Monday charged with historic sex offences.

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The allegations against the 15 defendants date back to between 2006 and 2009.

The investigation relates to two girls aged 13 to 16 at the time and include counts of rape, sexual assault, supplying cocaine and cannabis and making a threat to kill.

One of those due in court was a serving West Yorkshire Police constable, charged with sexual assault on a woman. Amjad Ditta, 35, was based in the force's Protective Services Operations. He has also carried out work in Bradford in recent years.

He is now suspended from duty.

The defendants listed to appear in Courtroom 1 on Monday morning are:

Mohammed Vaqaas Abbas, 30, of Hyde Park Road, Halifax, charged with three offences of raping a girl aged 13, 14 and 15 and three offences of supplying cannabis.

Nadeem Adalat, 34, of Mayfield Terrace South, Halifax, charged with four offences of raping a girl aged 13, 14 and 15 and four offences of supplying cannabis.

Sajid Adalat, 43, of Baines Street, Halifax, charged with one count of raping a girl.

Waseem Adalat, 33, of Balmoral Place, Halifax, charged with two counts of raping a girl aged 13 to 15, supplying cannabis and trafficking.

Amjad Ditta, 35, of Halifax, a police constable based with West Yorkshire Police’s Protective Services Operations, charged with one count of sexual assault on a woman at The Withens, Halifax.

Christopher Eastwood, 45, of Princeton Close, Pellon, Halifax, charged with two offences of raping a girl aged 13 to 15 and two counts of supplying cannabis.

Mohammed Rizwan Iqbal, 34, of Parkinson Lane, King Cross, Halifax, charged with one count of raping a girl aged 13 to 15.

Mahtab Islam, 46, Park Road, Halifax, charged with five offences of raping a girl aged 13 to 15, two charges of sexual assault, three charges of supplying cocaine, three counts of supplying cannabis and conspiracy to pervert the course of justice.

Ishtiaq Latif, 32, of Chestnut Street, Halifax, charged with one offence of sexual activity with a child aged 13 to15.

Asad Mahmood, 33, of Hyde Park, Halifax, charged with two counts of rape and one offence of trafficking.

Khalifa Mughal, 36, of Rawson Avenue, Halifax, charged with six counts of raping a girl aged 13, 14 and 15, one offence of conspiracy to pervert the course of justice, one charge of supplying cannabis, and three allegations of supplying cocaine.

Nadeem Nassir, 39, of Batley Field Hill, Batley, charged with two counts of raping a girl aged 13 to 15, two charges of supplying cannabis and making a threat to kill.

Shazad Nazir, 44, of Queens Road, King Cross, Halifax, charged with two offences of raping a girl aged 13 to 15 and two charges of supplying cannabis.

Shahzad Nowaz, 40, of Gibralter Road, Halifax, charged with one offence of rape, and a single charge each of supplying cannabis and making a threat to kill.

Sohail Zafar, 36, of Akeds Road, Halifax, charged with one offence of rape and a single charge of supplying cannabis.