A portion of an under-construction roof collapsed in Mawai village in the district early Wednesday, leaving four members of a family dead and eight injured, police said. The family of Rajpal Singh was sleeping on the ground floor of the house when a part of the under-construction roof on the the first floor fell. Twelve members of the family were trapped under the debris. District Magistrate Chandra Prakash Singh said Chief Minister Yogi Adityanath has expressed grief over the incident and that the administration will provide all possible help to the kin of the deceased.