David Cameron and London artist Jatinder Singh Durhailay were two of the winners at last night's annual Sikh awards, held at the Hilton Park Lane.
The Prime Minister said it was a "tremendous honour" to be given the Special Recognition Award for his work with the Sikh community in India.
Mr Cameron laid a wreath and signed a book of condolence at the memorial site in Jallianwala Bagh Gardens, in Amritsar, Punjab. He also marked the Sikh traditional festival of Vaisakhi, which has been celebrated at 10 Downing Street since 2011.
Jatinder Singh Durhailay, 25, from Ilford, won the People's Choice Award. The artist's work has been exhibited around the world, including at the Tate Modern and the National Army Museum.
The Sikh Awards, now in its fourth year, celebrates the achievements of the global Sikh community.