A Sig Alert has been issued on southbound Interstate 5 just north of Lomas Santa Fe, the California Highway Patrol confirmed.
Just after 1 p.m. Sunday a crash involving five vehicles happened on the freeway.
It is unknown if there are any injuries.
Traffic is backed up north of La Costa.
For immediate updates check NBC 7's Traffic page.
No other information was immediately available.
Check back for updates on this breaking news story.
