SUNOL (CBS SF) — Authorities issued a severe traffic alert Friday afternoon following a pair of accidents on CA-84 that closed lanes in both directions in Sunol and Livermore, according to CHP.

As of 3:17 p.m., CHP reports that the accident with injuries on CA-84 east of I-680 in Sunol has blocked all lanes in both directions.

At 3:38 p.m., authorities said one-way traffic controls were in effect.

There was no word from authorities as to how many people were hurt or the severity of their injuries.

There was an additional six-vehicle crash on CA-84 near Livermore that closed the roadway in both directions Friday afternoon.

CHP officers responded to the head-on collision near Vallecitos Road at about 2:30 p.m. after calls came in reporting that an SUV had collided with at least one other vehicle.

Four other vehicles were also involved and at least one ended up on its roof in the middle of the road, according to the CHP.

It also appears that four of the vehicles collided head on.

Only minor injuries were reported and the CHP is running one-way traffic control through the area until the road has been cleared, according to the CHP.

No additional information was immediately available.

Motorists are advised to expect delays and to use alternate routes to avoid both areas. There is no estimated time to reopen the roadway.