An advance team of World Health Organization medical experts arrived in China on Monday to help investigate the coronavirus outbreak, WHO chief Tedros Adhanom Ghebreyesus said.

Tedros, who met Chinese President Xi Jinping in Beijing last month, returned with an agreement on sending an international mission. It took nearly two weeks to get the green light from the Chinese government on the team, led by Canadian emergency expert Dr. Bruce Aylward.

"Bruce and his colleagues will be working with their Chinese counterparts to make sure we have the right expertise on the team to answer the right questions," Tedros told a news conference.