160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! AD Quality Auto 360p 720p 1080p Top articles1/5READ MOREGame Center: Chargers at Kansas City Chiefs, Sunday, 10 a.m. It was also not immediately known how many residents were forced to flee the mountaintop resort communities as many are part-time residents of the area, which at its seasonal height is home to upwards of 15,000 people. LAKE ARROWHEAD – Wind-whipped fires tore through the San Bernardino mountains for a third day Tuesday, forcing the evacuation of entire communities surrounding the resort area of Lake Arrowhead and raising the number of homes destroyed to more than 400. Thousands of people, including hospital patients, were forced to flee advancing flames that leaped through the mountains, burning one home after another and threatening as many as 10,000 residences, said U.S. Forest Service spokeswoman Gina Sampson. The two-pronged fire destroyed 425 homes in the Lake Arrowhead and Running Springs communities, sending thousands fleeing down the mountain, Sampson said. One of the fires was threatening at least 10,000 homes; the other was threatening 400. Mountain Community Hospital in Lake Arrowhead was evacuated, and patients in hospital gowns were transported out of the area. Sampson said it was not immediately known where the patients were taken.