A transgender former Rikers Island jail inmate has sued the city, claiming she was raped by a guard and then paid off with an iPad Touch not to report it.

The lawsuit -- the latest in a series of prosecutions, reports and civil suits that have painted a withering picture of conditions at the city jail -- says the assault was the product of a "culture of rape and systemic sexual abuse" the city has allowed to flourish through inadequate policing of the jail.

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The Manhattan federal court complaint alleges the rape occurred in December 2012 in a clinic area of the jail where there are no cameras. The inmate, identified by the initials M.T., has since been sentenced for burglary and is at an upstate jail.

A spokeswoman for the city Department of Corrections said the allegations are being investigated, and noted that as part of ongoing reforms to improve safety the city opened a 30-bed transgender housing unit at Rikers late last year.

A class-action suit filed in May by two female inmates alleged an epidemic of sexual abuse of women by Rikers guards. That case, filed by the Legal Aid Society, is pending.