BRENTWOOD -- A California Highway Patrol officer providing traffic control for the Amgen Tour of California was seriously injured Saturday afternoon in Brentwood.

The CHP Oakland motorcycle officer, who will survive, was hit around 12:30 p.m. by a car that made a U-turn and collided with the officer on Marsh Creek Road, just east of Deer Valley Road, according to CHP spokesman John Fransen.

It is unknown what caused the driver to veer into the officer, Fransen said. It is also too early to tell if the driver will face charges.

The officer was taken by helicopter to John Muir Medical Center in Walnut Creek with moderate to major injuries, Fransen added, but CHP later tweeted the officer would be "OK."

Saturday was the penultimate leg of the cross-state tour, where cyclists were racing from Livermore to the top of Mount Diablo.

Two hours later, police officers had to clear Second Street in downtown Livermore after a business owner had reported finding a suspicious package in a dumpster that was supposed to be empty.

As an extra step in security measures in the aftermath of the Boston Marathon bombings, police cleared out all dumpsters and trash cans in the downtown area before the race, according to Livermore police Officer Traci Rebiejo.

"It was a tightly packaged cardboard box, and it had an Orange County, Calif., label on it," she said of the package. "It was definitely suspicious."

Rebiejo said the Alameda County bomb squad was called out to check the package, which they determined was actually a discarded box full of postcards.

Though cyclists racing in the Amgen Tour of California had already passed through, the evacuation did put a bit of a damper on festivities, Rebiejo added.

"Our priority was that everyone was safe," she said.

The evacuation order was lifted shortly after 4 p.m.