A rapper affiliated with Wu-Tang Clan was rushed to the hospital early Wednesday after he cut off his penis and then jumped off a second story balcony in what police believe is a suicide attempt ... law enforcement sources tell TMZ.

Our sources say ... they were called to an apartment building in North Hollywood at around 1:00 AM and found Andre Johnson on the sidewalk critically injured.

Johnson was rushed by ambulance to Cedars-Sinai Medical Center. It's unclear if doctor's are attempting to reattach Johnson's penis.

Johnson is a rapper who was in a group founded by members of Wu-Tang Clan.

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