Washington. The US on Monday strongly condemned the attack on the Indian Consulate in San Francisco by some pro-Khalistan elements, calling it completely unacceptable. A group of pro-Khalistan protesters attacked and vandalized the Indian consulate in San Francisco on Sunday. Raising pro-Khalistan slogans, the protesters broke temporary security barriers put up by the police and put up two so-called Khalistani flags inside the consulate premises.