San Francisco District Attorney George Gascon today announced felony charges against two Alameda County sheriff's deputies caught on camera beating a suspect after a high-speed chase from unincorporated San Leandro to the Mission District in November.

Deputy Luis Santamaria, a 14-year veteran of the Alameda County Sheriff's Office, and Deputy Paul Wieber, a three-year veteran, are charged with assault under color of authority, battery with serious bodily injury and assault with a deadly weapon, Gascon said. The two deputies are expected to surrender by the end of the day Wednesday, with bail set at $140,000 each.

Today, Sheriff Greg Ahern spoke with the media and answered questions about charges filed… https://t.co/xuVkDnHSoS — ACSO (@ACSOSheriffs) May 10, 2016 Alameda County Sheriff Gregory Ahern said it's the first time since 1969 that deputies in his department have been charged with using excessive force.

Ahern said Santamaria and Wieber "will have to answer for their actions" now that criminal charges have been filed against them. He said the two deputies, who are on paid administrative leave, are also the subject of an internal affairs investigation by his department that could result in them being fired or having their pay reduced.

Ahern said that since the November incident, his department has increased its training about the use of force and revised its body camera procedures to make it mandatory that deputies turn them on when they're interacting with the public.

Ahern said he has gone to training classes "to preach about the difference between being a warrior and being a guardian" and said inappropriate use of force by his deputies "will be met abruptly."

Prosecutors say Santamaria and Wieber struck 29-year-old Stanislav Petrov at least 30 times over the course of 40 seconds in the head and hands with their batons in the early morning hours of Nov. 12. Petrov suffered injuries including a concussion, broken bones in both hands, a mild traumatic brain injury and deep cuts to his head. "Policing that violates our constitutional rights damages the reputation of every person that wears the uniform, and it damages the public's perception of those that are sworn to serve," Gascon said.