Does blood discharge from the penis nullify ablution and invalidate prayer?

The emission of blood from a man's penis invalidates ablution (wudu') according to the majority of scholars, because it is an impure discharge or a discharge from a private part. The correct view is that it nullifies ablution because it is a discharge from a private part, thus resembling urine. Imam Malik holds the view that the emission of blood from the penis does not invalidate ablution because it is rare and unaccustomed. However, the emission of blood from other than a private part does not invalidate ablution.