Following a 90-day investigation ordered by President Joe Biden, US intelligence agencies remain divided on the origins of the coronavirus but believe China’s leaders did not know about the virus before the start of the global pandemic, according to results of the review released on Friday. 

Going by an unclassified summary, four members of the US intelligence community say with low confidence that the virus was initially transmitted from an animal to a human.

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Meanwhile, a fifth intelligence agency believes with moderate confidence that the first human infection was linked to a lab. But analysts do not believe the virus was developed as a bioweapon.

With China refusing to fully cooperate with the United States and ongoing international investigations of the virus, the review of the virus’ has been hampered, according to inputs from the Associated Press.

The Director of National Intelligence said Friday that China “continues to hinder the global investigation, resist sharing information and blame other countries, including the United States.”

The source of the coronavirus is still a major public health and security issue across the world. Many conservatives in the United States have accused Chinese scientists of creating COVID-19 in a lab and allowing it to spread. The virus most likely spread from animal to animal in a process known as zoonotic transmission, according to scientists.

Following the release of the review, Biden, in a statement, said China had obstructed efforts to investigate the virus “from the beginning.”

“The world deserves answers, and I will not rest until we get them,” he said. “Responsible nations do not shirk these kinds of responsibilities to the rest of the world.”

Ahead of the release of the report, China’s foreign ministry attacked the U.S. investigation with Fu Cong, a foreign ministry director general, saying at a briefing that “scapegoating China cannot whitewash the U.S.”

“If they want to baselessly accuse China, they better be prepared to accept the counterattack from China,” he said.

In May this year, Biden ordered the review of what the White House said was an initial finding leading to “two likely scenarios”: an animal-to-human transmission or a lab leak.