Border 2 Fire. Border 2 Fire initially started 1:58 p.m. Jan. 23 in San Diego County. After being active for a week, it has burned 6,625 acres. By

The fires come as San Diego County mountains and valleys, along with other parts of Southern California, remain under a red flag warning.

Border 2 Fire initially started 1:58 p.m. Jan. 23 in San Diego County. After being active for six days, it has burned 6,625 acres. A fire crew of 1,510 effectively contained 90% of the fire by Wednesday morning. The blaze's cause remains under investigation.

As of Thursday morning, firefighters had the footprint of the 6,625-acre blaze, dubbed the Border 2 Fire, 100%, according to Cal Fire.