UPDATE (9:01 a.m.): The California Highway Patrol said just after 7:30 a.m. they responded to southbound Highway 99 north of Merced Avenue for a semi-truck crash. 

Officials said a semi-truck traveling on northbound Highway 99 veered to the left for unknown reasons and collided into the center divider. The truck over turned into the southbound lanes. 

The overturned northbound semi-truck collided with another semi-truck that was heading southbound on Highway 99. It also turned over. 

No one injured in the crash. 

One of the semi-trucks was carrying butter, it spilled across the roadway. Officials are calling Kern County Environmental Health to the scene to evaluate. 

All lanes of southbound Highway 99 are blocked, traffic is being diverted to the right hand shoulder, but the crash is slowing traffic in the area. 

The roadway is expected to remain blocked until 11 a.m. or noon. 

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The California Highway Patrol is responding to a semi truck crash on southbound Highway 99 just north of Merced Avenue. 

Initial reports are that two semi trucks are involved and one is currently blocking three southbound lanes. 

It is unknown how many vehicles are involved in the crash or how severe the injuries are at this time. 

23ABC has a crew headed to the scene, check back for updates or tune into 23ABC News at 8 a.m.