By Cecilio Padilla

SACRAMENTO (CBS13) — Traffic is backing up severely along northbound Highway 99 in Sacramento after a crash early Monday morning.

The crash happened just before 6 a.m. near the Fruitridge Road offramp.

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Traffic is now backing up past Florin Road. (Credit: Caltrans)

Exactly what led up to the crash is unclear, but several vehicles were involved.

Several lanes in the immediate area of the crash are blocked, leading a backup on northbound Highway 99 that’s now stretching all the way to Mack Road.

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More from CBS Sacramento:

Drivers should expect heavy delays for the time being.

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Updates to follow.