KINSHASA, Congo (AP) — The head of the World Health Organization has arrived in Congo to support measures being ramped up to slow the world’s fastest-growing Ebola outbreak, the agency said Wednesday, as confirmed cases reach nearly 4,000.

WHO Director-General Tedros Adhanom Ghebreyesus arrived in Kinshasa, Congo’s capital, late Tuesday night and is scheduled to meet with partners and Congo’s President Félix Tshisekedi, the WHO country office told The Associated Press. It’s his second visit to the country since the outbreak was declared in mid-May.