BEIJING — Chinese security forces on Saturday fired into a crowd of Tibetans in a restive area of Sichuan Province after they tried to take away the body of a Tibetan man who had died after setting himself on fire that morning to protest Chinese policies in the Tibetan areas, according to reports from two Tibet advocacy groups and Tibetan officials in the exile government in India.

It appeared that at least two people had been hit by gunfire, and one of those might have been killed, said Kate Saunders, a spokeswoman for International Campaign for Tibet, which is based in Washington. Ms. Saunders said the group had spoken to at least two sources.

Another group, Free Tibet, said it had confirmed reports that a Tibetan woman was shot. There were unconfirmed reports that many others were also hit, said Stephanie Brigden, the director of the group, which is based in London. Security officials in the area could not be reached for comment on Saturday night.

The violence took place in the town of Aba, known in Tibetan as Ngaba, a focal point for protests against Chinese rule and the scene of civilian deaths during a widespread Tibetan uprising in 2008. Since then, it has been the site of at least 11 self-immolations, some of them fatal. Those setting themselves on fire have mainly been monks, nuns or former members of the clergy. The monks in Aba who set themselves on fire all come from the Kirti Monastery, where anger has grown over Chinese repression of religious practices.