Officials say it was arson that caused an enormous fire that damaged a stretch of the I-10 Freeway near downtown L.A., shutting it down to traffic. The closure has made L.A.’s already terrible congestion even worse for commuters across much of the city.State transportation officials say they're working around the clock to speed the reopening of the 10 Freeway. But they acknowledge they face a difficult challenge and have no idea when the repairs will be finished.Reporter: Frank Stoltze, LAistThe closure of the 10 Freeway is not only affecting people who drive to work each day. It’s also affecting some parents who drop off their kids at school, and teachers and staff at these schools.   Reporter: Mariana Dale, LAistCalFire is downsizing its seasonal staff in the northern part of the Bay Area, following the end of fire season. The North Bay has been the site of some of the region's most devastating wildfires.Reporter: Danielle Venton, KQED Learn more about your ad choices. Visit megaphone.fm/adchoices