Mother Teresa has been declared a saint by Pope Francis.

The nun and Nobel Peace Prize winner was canonised in a ceremony in the Vatican's St Peter's Square.

An estimated 100,000 people attended the mass for the nun, who was famous for her work with the poor in the slums of Kolkata in India.

Her elevation to sainthood comes on the eve of the 19th anniversary of her death.

To become a saint in the Catholic church, candidates must have performed two verified "miracles".

Two people say prayers to Teresa cured them of fatal diseases - a woman in India who had ovarian cancer and a man in Brazil whose brain tumours disappeared.