British Prime Minister David Cameron Wednesday termed as "shameful" the Jallianwala Bagh massacre of innocent Indians by British troops.

"This was a deeply shameful act in British history. One that Winston Churchill  rightly described at that time as monstrous. We must never forget what happened here and we must ensure that the UK stands up for the right of peaceful protests," Cameron wrote in the visitors' book of the memorial.  

However, Cameron, who is the first British prime minister to visit the Jallianwala Bagh, did not offer any apology for the massacre.

The British prime minister earlier paid homage at the Jallianwala Bagh memorial, the site of the massacre of hundreds of men, women and children by British troops April 13, 1919.

Queen Elizabeth too had visited the Jallianwala Bagh memorial in October 1997 and paid homage to those killed in the massacre of unarmed Indians by British forces led by Brigadier General Reginald Dyer.