The alert, issued just before 5 a.m., and freeway was reopened at before 5:45 a.m.
No further information was immediately available.
Click here for traffic maps and drive times.
Sig Alert cancelled, all lanes of NB 680 have reopened at Treat Blvd. Still have delays in both directions. pic.twitter.com/pav2M5SAQN— Alexis Smith (@AlexisABC7) April 12, 2018