Thousands of protesters representing the 'upper caste organisations' on Thursday took to the streets across the country to protest against the amendments in the SC/ST (Prevention of Atrocities) Act. In view of the ongoing protests and a Bharat bandh call given by some social organisations, the Madhya Pradesh police have tightened security across the state. While schools remain shut in a few districts, petrol pumps are closed all over Madhya Pradesh.