San Jose crews knocked down a two-alarm fire at a commercial structure in the city’s downtown area Thursday morning, according to fire officials. The San Jose Fire Department said crews were alerted to a fire at a vacant commercial structure in the area of Second and San Salvador streets around 7:45 a.m. The blaze was contained shortly after 8 a.m., the fire department said. There were no reported injuries. The public is advised to still avoid the area.