MUMBAI, INDIA:  A low-caste - dalit or the oppressed - Hindu girl waits while an Indian Border Security Force Personnel keeps a vigil at a homage site in Mumbai, 06 December 2006.  More than 200,000 Hindus at the bottom of India's caste hierarchy gathered in the financial hub Mumbai to pay tribute to their iconic leader B R Ambedkar, a low-caste Hindu who fought against discrimination and who died 50 years ago. In a yearly ritual, low-caste Hindus gather at Ambedkar's 'Chaityabhoomi' (pure-land) memorial in central Mumbai from across western Indian state Maharashtra and neighbouring states. Security forces were on high alert across Mumbai after caste riots claimed four lives last week.  AFP PHOTO/ Sajjad HUSSAIN  (Photo credit should read SAJJAD HUSSAIN/AFP/Getty Images)