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Image of alleged iPhone 5S user guide notes 'Touch ID sensor'

Illustration shows handset buttons' physical locations, including that of a much-rumored fingerprint sensor.

The touch sensor on the new iPhone 5S?

Mere hours before the Apple is expected to unveil a new iPhone with a much-rumored fingerprint sensor, an image of an alleged iPhone 5S user guide has materialized that features a combination "Home button/Touch ID sensor" at the below the screen.

iPhone 5S user guide? (click to expand image)

The purported guide photo, surfaced by, displays the locations of the physical buttons for what is identified as an iPhone 5S. Apparently sporting the new "flat" iOS 7 icons, the image also indicates the location of the "Lightning connector," "Volume buttons," and "Sleep/Wake button."

The illustration emerges just hours after The Wall Street Journal reported that it had confirmed that Apple will include a fingerprint scanner on a high-end iPhone expected to be announced Tuesday. Supposedly working with a simple touch on the front of the smartphone, the security feature is widely expected to replace conventional four-digit passwords.

Rumors that the Apple was working on incorporating such technology into its handsets began to mount last year after the iPhone maker bought fingerprint sensor and identity management software company Authentec. Meanwhile, an Apple patent application published in July by the US Patent and Trademark Office describes a technology in which a sensor is used to determine whether a user has proper credentials to access the device based on the trace a person's finger and fingerprint.

Apple is expected to unveil the iPhone 5S and a cheaper iPhone 5C model at a press event on Tuesday. Follow CNET's live blog at 10 a.m. PT to get a real-time breakdown of the event.