Washington: The US has appealed to China to allow access to journalists and diplomats in Tibetan areas as it expressed serious concern over recent reports of self-immolation of two monks there.

"We are seriously concerned by reports of two recent self-immolations of monks from the Ngaba Kirti monastery in China’s Sichuan province," the State Department said in a statement.

In light of the continuing underlying grievances of China's Tibetan population, "We again urge Chinese leaders to respect the rights of Tibetans, to address policies in Tibetan areas that have created tension, and to protect Tibetans' unique religious, cultural and linguistic identity," it said.

The statement also said: "We continue to urge the Chinese government to allow access to Tibetan areas of China for both journalists and diplomats."

After the self-immolations in protest, authorities have reportedly banned public gatherings and text messages through mobile phones.