The U.S. intelligence community does not believe it can resolve a debate over whether a Chinese laboratory incident was the source of COVID-19 without more information, U.S. officials said in a declassified summary on Friday.

U.S. officials said only China can help solve questions about the true origins of the virus that has now killed 4.6 million people worldwide. "China's cooperation most likely would be needed to reach a conclusive assessment of the origins of COVID-19," they said.

President Joe Biden, who received a classified report earlier this week summarizing the investigation he had ordered, said Washington and its allies will continue to press the Chinese government for answers.