Doctors say the Pope's health's presenting a 'complex clinical picture' - as he receives further hospital treatment for an infection.
The 88-year-old was admitted on Friday.
Wednesday's planned weekly audience in St Peter's Square has been cancelled.
Hannah Brockhaus is the Catholic News Agency's Vatican correspondent, and says he's had difficulty speaking at length recently, because of some breathing issues.
Pope's condition "complex", according to Vatican
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