Kelsi Thorud reports on the teacher strike in San Francisco. Website: http://kpix.com/ YouTube: http://www.youtube.com/CBSSanFrancisco Facebook: https://www.facebook.com/CBSSanFrancisco Instagram: https://www.instagram.com/kpixtv/ Twitter: https://twitter.com/KPIXtv

San Francisco public schools will be closed for a fourth day on Thursday because of the teacher strike, said a spokesperson for the San Francisco Unified School District on Wednesday afternoon.