A new fire broke out on Otay Mountain, near the US-Mexico border, on Thursday, January 23, sending plumes of smoke skyward.Live footage captured by ALERTCalifornia/UC San Diego’s cameras shows the blaze which has a “dangerous rate to spread”.According to Cal Fire San Diego, the brushfire originated near the Otay Mountain Truck Trail.In just over an hour, it had grown to 140 acres.The Chula Vista Fire Department said the fire did not pose any threat to the city of Chula Vista at this time. Credit: ALERTCalifornia/UC San Diego via Storyful