VIDEO: Forward progress of a three-alarm vegetation fire burning by homes along westbound I-580 near 35th Avenue in Oakland has been stopped, according to authorities. The fire reportedly started in brush along the freeway just before 5 p.m. The Oakland Fire Department Twitter account posted video of the fire at about 5:15 p.m. Oakland Fire officials later confirmed that multiple structures above westbound I-580 were threatened by the fire. No injuries have been reported on scene so far. Approximately 40 firefighters are battling the fire and an ambulance is on standby. Three engine companies are working the fire with Hayward and Alameda County crews helping the Oakland Fire Department. By shortly after 6 p.m., officials confirmed that the fire had reached three alarms, but crews had confined if not contained the fire.