Chambers, the 73-year-old singer of the legendary 1960's music group The Chambers Brothers, was assailed around 5 p.m. Saturday while on stage at Hayward Russell City Blues Festival.

According to police and witnesses, the singer had dedicated Curtis Mayfield’s “People Get Ready” to Martin when 43-year-old Dinalynn Andrews Potter jumped up and shoved Chambers to the ground after allegedly yelling “It’s all your fault!”

“Dylan Here.... Lester was just assaulted on stage at The Russell City Hayward Blues Festival by a crazed woman after dad dedicated People Get Ready to Trayvon Martin. He is on the way to the hospital now,” wrote Dylan Chambers, Lester’s son, on the musician’s official Facebook page.

Chambers was taken by ambulance to a nearby hospital where he was treated and released.

Andrews Potter was subdued soon after the incident and detained by police. She was charged with suspicion of battery, cited and then released, according to Lt. Ruben Pola of the Hayward Police.

Pola added that additional charges could be brought against Andrews Potter later.

Dylan Chambers posted on Facebook Sunday that the singer, a Petaluma resident, was recovering at home from the attack.

“A bruised rib muscle and nerve damage and he is sore all over...” Dylan wrote to accompany a picture he posted on Facebook that showed Chambers’ 8-inch bruise on his back.

Chambers’ relatives said that the attack was racially motivated and want police to file hate crime charges against Potter.

Florida resident George Zimmerman had been charged with second-degree murder in the fatal shooting of 17-year-old Martin, who was unarmed, back February 2012. Zimmerman had argued self-defense in the death, which sparked national controversy.

A jury found Zimmerman not guilty of all charges Saturday, which sparked protests all over the nation that evening and the following day.

Started in 1954, the Chambers Brothers, described on Wikipedia as a "soul music group," are best known for the 1968 hit single "Time Has Come Today."