Urgent _ foreigners protection in india

I would like to know if there is any law in Delhi to protect foreigners from any verbal threat or physical harassment by Indians here. What is the procedure to file a case against Indian threatening the life of a foreigner who has come to visit the relatives from her mom’s side? Shall she go and make a complain first in the embassy, would this directly be filed to higher court of Delhi and arrest the accused parties. Would foreign affairs interfere here to take any action not to harm the visitors to India?  Please advise. Thanks