The World Health Organization (WHO) has postponed deciding whether to declare a deadly new virus that emerged in China a global health emergency.

Speaking at a press conference Wednesday, WHO Director-General Dr. Tedros Adhanom Ghebreyesus said the emergency committee on the novel coronavirus would meet again Thursday after it was “split” over the decision.

“This is an evolving and complex situation. The decision of whether to declare it a public emergency is one I take extremely seriously,” said Tedros, who said advice on measures to be taken would also be given later.

Read more: WHO committee delays decision on China coronavirus