The attackers pushed Singh to the ground, causing his turban to fall off. His face was blackened and beaten by the men before his supporters took him to a place of safety.
A video of the incident was shared by ANI on twitter. Check here:
Singh, who had travelled to California following a visit to New York, said the purpose of his visit was to hold discussions among the Sikh community about the 550th birthday anniversary celebrations of Guru Nanak, to be commemorated next year.
As per reports 3 people have been arrested in connection with the attack.
The DSGMC chief recalled the incident and said that a group of over 20 people had attacked him.
“I was attacked by more than 20 people, these people have not even kept the dignity of a Gurdwara. I told my aides to not say a word and maintain peace. We will not be cowed down by all this,” he said.
Reacting to the incident, Union Cabinet Minister of Food Processing Harsimrat Kaur Badal tweeted, "Strongly condemn the cowardly attack on unarmed @ManjitGK at the Yuba City Gurughar in complete disregard of Maryada and Sikhi! To these agents of ISI, the only way to get referendum is by attacking n intimidating Sikhs. No Sikh will ever be cowed down by your dastardly acts."
Condemning the attack, her husband and Shiromani Akali Dal (SAD) leader Sukhbir Singh Badal also wrote on the micro-blogging site, "I strongly condemn the cowardly attack on Manjit Singh GK. He was unarmed and paying obeisance at Gurughar where he was attacked by goons backed by ISI. @Akali_Dal_ has never cowed down to terror and will continue to stand strong on the principles of Sikhism!"
This is the second such attack on Singh in this week.
On Monday, singh and his family faced attack by Khalistan sympathisers at a TV studio in New York.
After this Singh had sought help from External Affairs Minister Sushma Swaraj.