Bhopal, 23/6: Senior Congress leader Digvijaya Singh on Thursday staged a sit-in to protest the demolition of the houses of some tribal families at Rapura village in Sagar district of Madhya Pradesh. A forest ranger was subsequently suspended by the authorities.I came to know that the houses of tribals and others were demolished with the help of bulldozers under police protection in Rapura village around 10.30 pm on Wednesday,” the Rajya Sabha member told reporters here. Under which law these houses, built under the Pradhan Mantri Awas Yojna, were demolished, he asked.