(KRON) — A severe traffic alert was reported Thursday morning on eastbound CA-84 east of the Dumbarton Bridge due to two separate traffic collisions with major injuries, according to the California Highway Patrol.

All eastbound lanes of the Dumbarton Bridge were blocked at 6:17 a.m. before reopening at 9:52 a.m. Thursday morning.

A Ford pickup truck was traveling just east of the Dumbarton Bridge decline at approximately 5:39 a.m. when the vehicle crashed into a concrete divider, CHP Hayward said. After the collision, the truck came to a rest on its roof in the No. 2 lane. CHP Hayward reported that the driver sustained “major injuries” in the crash. The current condition of that person is unknown at this time.

A second vehicle hit the overturned truck shortly after the first crash, police said. According to CHP Hayward, that car attempted to swerve to avoid the collision and lost control, hitting the truck. The driver of the second vehicle sustained minor injuries as a result of the crash, authorities said.

Eastbound lanes of the Dumbarton Bridge closed Thursday morning. (Photo: Caltrans)

Just after 6 a.m., the westbound lanes of CA-84 in the area were also closed. All lanes in the westbound direction have reopened.

Motorists in the area should expect residual delays after the roadway reopened.

This is a developing story. Check back for updates.