Repolling will be held at the polling stations in Ratabari, Sonai and Haflong constituencies on April 20, the ECI said in a letter addressed to the Chief Electoral Officer, Assam. "The Commission declares void, the votes cast at these polling stations on April 1," it said. All the three constituencies went to polls in the second phase of Assam assembly elections on April 1. The ECI order said, repolling will be held at Ratabari (SC) contituency's polling station number 149 at Indira M V School, after an electronic voting machine (EVM) was found in a car belonging to the wife of a BJP candidate.