The U.S. is considering new sanctions on Chinese surveillance companies over sales to Iran’s security forces, officials familiar with the deliberations said, as Iranian authorities increasingly rely on the technology to crack down on protests, The Wall Street Journal reported.

U.S. authorities are in advanced discussions on the sanctions, according to the officials, and have zeroed in on Tiandy Technologies Co., a surveillance-equipment maker based in the eastern Chinese city of Tianjin whose products have been sold to units of Iran’s Islamic Revolutionary Guard Corps, a hard-line paramilitary group.

Sanctions against Tiandy are being considered by both the State Department and the Treasury, said the officials. If implemented, the move could put the company at risk of being cut off from the American financial system and cripple its ability to conduct business in U.S. dollars.