BEIJING — A Tibet advocacy group based outside China said in a report released Friday that two Tibetans were killed Thursday night by Chinese paramilitary officers who were raiding a monastery in Sichuan Province to detain rebellious monks.

The group, the International Campaign for Tibet, said security officers beat to death a man, Dongko, 60, and a woman, Sherkyi, 65, as they gathered with other people outside Kirti Monastery to try to prevent 300 monks from being taken away.

Officers from the People’s Armed Police, a paramilitary force usually deployed to quell riots, had put the monks in 10 trucks, the group said, citing as its source a monk from Kirti living in exile who remained in contact with the monastery. The officers then clashed with a large number of laypeople, many of them elderly, who tried to prevent the trucks from driving out the main entrance gate, the group said.

The report could not be independently confirmed, though information from the International Campaign for Tibet has generally been accurate. Several human rights groups said this week that Chinese officials had begun barring foreigners from the area.