Two of the people arrested are mafia members who are "wanted on a number of murders" in India.
Authorities said the shooting is not related to a hate crime.
About 50 people from various religious group attended a press conference on April 11, in West Sacramento, where California Assemblywoman Mariko Yamada, D-Davis, announced the introduction of Assembly Bill 1964, which would strengthen religious freedoms in the workplace.
Stanislaus County Sheriff Adam Christianson said the assault is being investigated as a hate crime.
'The resolution is the first time that any state, nation or investigative body has declared that the Indian government was responsible for the 1984 genocide of Sikhs.'
About 200 people from various interfaith groups joined the memorial and candle light vigil held in honour of Parminder Singh Shergill, an Iraq war veteran, who was shot dead by local police on January 25 at Lodi, California.
Various Sikh organisations on Friday held a demonstration in front of the Indian Consulate in San Francisco, California, in memory of those who were killed during Operation Blue Star, on the 27th anniversary of the military offensive.
Three years after the horrific massacre of Sikh worshippers at the Oak Creek, Wisconsin, gurdwara by a gunman with ties to supremacist organisations, a federal system to help track hate crimes against Sikhs, Hindu, Arab American communities has been formalised.
Babulal 'Bob' Bera, US Congressman Ami Bera's 83-year-old father, faces five years in prison.
