PHNOM PENH, Cambodia: Cambodian Prime Minister Hun Sen was forced to return home early this week from the G20 Summit in Indonesia after testing positive for COVID-19.

"This is my biggest concern," he said in an audio message on his Facebook page. "Among those, the Indonesian president who is the next rotating chair of ASEAN, was always with me."

"Besides him, there are some other leaders who were close with me, shook hands and travelled together, including the U.S. president, who sat together at dinner and travelled together," Sen added.

It was not known whether any of the leaders at the G20 meeting have tested positive for COVID-19.

Summit host Indonesia has strict COVID-19 protocols in place, including mask mandates, body temperature checks, mandatory antigen and PCR swab tests, to prevent the risk of the spread of Covid.

U.S. President Joe Biden, who is tested regularly for COVID-19, had a negative test on the morning of November 15, according to the White House.