A bombing attack on a Medecins Sans Frontieres hospital and pharmacy in South Sudan over the weekend was deliberate and may amount to a war crime, the U.N. Commission on Human Rights in South Sudan said on Tuesday.

A deliberate bombing attack on a Medecins Sans Frontieres hospital in South Sudan may constitute a war crime, according to the U.N. Commission on Human Rights. The attack killed seven people and wounded 20.

At least seven people were killed and 20 injured in an attack on a hospital and market in South Sudan on Saturday, a medical charity has said, as worries mount that the country could return to all out civil war.