California Highway Patrol said it has arrested the FedEx driver who hit and severely injured an officer on suspicion of driving under the influence.

41-year-old Gregory Anthony Ramirez was transported to the CHP South Sacramento Area Office after the accident, where it was determined he was under the influence.

CHP said Ramirez is facing felony DUI charges, causing injury and possession of a controlled substance.

The officer's name has not been released. He suffered major injuries and is expected to survive, CHP said.

CHP said the officer was investigating a hit-and-run involving two vehicles at around 3:10 a.m. One of the drivers involved in the hit-and-run fled on foot and may have been intoxicated. The investigation into the hit-and-run is continuing, CHP said.

At about 3:30 a.m., a FedEx truck traveling through the area of the hit-and-run struck a CHP patrol vehicle that had responded to the earlier crash. The officer who was injured was outside the patrol vehicle when it was struck, CHP said.

FedEx released a brief statement on the incident:

"First and foremost our thoughts are with the officer and others involved in this accident, and we are cooperating fully with the authorities as they conduct their investigation."