World Health Organization experts will visit the city of Wuhan, where the coronavirus was first detected in late 2019, at the start of their investigation into the origins of the pandemic.

China Foreign Ministry spokesperson Zhao Lijian said the experts will arrive in Wuhan today. Other details of their schedule haven’t been announced and the central government’s National Health Commission offered no further information.

The visit has been expected for months. WHO chief Tedros Adhanom Ghebreyesus expressed frustration last week that arrangements were taking so long to finalize. After China announced the visit Monday, Tedros said the scientists, who come from several nations, will focus on how the coronavirus first jumped to people.