A senior Chinese official said on Tuesday that the country has vaccinated 60,000 people against COVID-19, and none experienced any adverse reactions, according to multiple reports.

Tian Baoguo, a senior official at China’s Ministry of Science and Technology, confirmed the number at a news conference.  

“Initial results show that they are safe,” he told reporters.

The vaccinations come before any of China’s potential inoculations have completed clinical trials. Four potential vaccines are in the last stage of clinical trials in the country.

Officials said the experimental use of the vaccines would not be part of data from the trials, The New York Times noted. Experts have warned that vaccines that have not completed clinical trials pose health risks.

The Chinese city of Yiwu stopped the sale of COVID-19 vaccines on Sunday after dozens of people demanded them over the weekend, the Times added. The local government said Friday that it would allow residents to be inoculated in “emergency use” cases.

Sinopharm, a Chinese state-owned company that has two potential vaccines in late-stage clinical trials, has said that hundreds of thousands of people have received the vaccines, according to the newspaper. Another company, Sinovac, has said that over 10,000 people in the Beijing area have been injected.

Zheng Zhongwei, head of China’s COVID-19 vaccine development task force, said at the Tuesday news conference that China is expected to produce as many as 610 million vaccine doses by the end of the year.