Fire activity in SF's Mission District causing delays

SAN FRANCISCO - Officials are asking drivers to avoid an area in San Francisco's Mission District due to fire activity. 

Emergency crews are at the scene of 13th and 14th Streets. It's unclear what the situation is, but drivers in the area can expect traffic delays. Others should seek alternate routes. 

There's no time when the area will be clear. 

This story is developing, check back for updates.