Photographers take pictures of a police vehicle burnt by the angry protestors from an ethnic Gujjar community on the outskirts of New Delhi June 1, 2007. Ethnic Gujjars demanding reserved places in government jobs and colleges blocked highways for the fourth day and violence spread to New Delhi with sporadic incidents of stone throwing and attacks on police vehicles. India has quotas for lower caste and tribal groups in government jobs and colleges but more groups are demanding access to reserved seats, fuelling social tension and protests.