The Prime Minister made his entry in the book of condolence seated at a table before a memorial plaque which read: "This place is saturated with the blood of those Indian patriots who were martyred in a non-violent struggle to free India from British domination."
Before making his entry, the Prime Minister viewed the flame which burns continuously at the memorial in honour of the fallen.
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Derby was unable to play with other dogs after being born with severely deformed front legs - but can now run freely.
The judge said the 14-year-old had been subject to a great injustice. He was executed for the murder of two little girls in 1944.
It will be a dull and damp day today, with heavier and more persistent rain to the northwest and across Wales.