RICHMOND, Calif. (AP) - Prosecutors in California's Bay Area are expected to file charges against two former Chevron contractors they say attacked a Sikh man with a pocket knife last month. A third attacker has not yet been identified.

The East Bay Times reports that authorities say the men removed 41-year-old Maan Singh Khalsa's turban and cut off a fistful of his hair. Khalsa's religion mandates that he not cut his hair.

Khalsa, a Richmond father, is waiting to hear if his finger will need to be amputated because of an infection to a cut he received while fighting off his attackers.

About 30 faith-based and advocacy groups sent a letter to the District Attorney's office Thursday calling for hate crime charges in the attack. Prosecutors say they are considering the charges.