The footage of cops in Alabama slamming Sureshbhai Patel to the ground was captured by the dashcam of a car nearby. It's absolutely gut-wrenching.
The footage shows the disproportionate force used on 57-year-old Patel, who was out strolling near his son's house in Madison, Alabama, where he had arrived the previous day to help take care of his 17-month-old grandson.
Patel is now partially paralysed and recovering in a city hospital.
It is clear from the video that Patel was unable to stand or walk after the unprovoked attack.
Eric Parker, the officer who assaulted Patel, has been arrested. Alabama police chief has offered apologies to Patel and his family and has said the Federal Bureau of Investigation will look into the incident.
The incident occurred on the morning of February 6.
"I sincerely apologise to Mr Patel, Mr Patel's family and our community. We strive to exceed expectations," Madison City Police chief Larry Muncey told reporters at a news conference. "Additionally FBI would be conducting a parallel inquiry to ascertain if there were any federal violations," Muncey said.
"As a result of the investigations, I found that Mr Parkers's actions did not meet the high standard and expectations of the Madison City Police Department," he said, adding, that he (Muncey) has proposed termination of officer Parker, who has now been arrested for third-degree assault.