<p>Four labourers were killed while 20 others injured after a portion of a three-storey rice mill building collapsed in Haryana's Karnal district early Tuesday, police said.</p>.<p>Rescue operations at the site were underway.</p>.<p>Some workers told reporters at the site that over 150 labourers were sleeping in the building at the time of the incident.</p>.<p>"Four persons have died," SHO, Taraori, Sandeep told PTI over phone.</p>
<p>Four labourers were killed while 20 others injured after a portion of a three-storey rice mill building collapsed in Haryana's Karnal district early Tuesday, police said.</p>.<p>Rescue operations at the site were underway.</p>.<p>Some workers told reporters at the site that over 150 labourers were sleeping in the building at the time of the incident.</p>.<p>"Four persons have died," SHO, Taraori, Sandeep told PTI over phone.</p>