A UN Emergency Task Force team heading to Tigray has reportedly been blocked in Serdo, Afar regional state by Ethiopian security forces on 6 July.
MSF has called for an immediate investigation into the killing of its three staff members in Tigray.
MSF said: “In response to the killings, we have made the extremely painful but necessary decision to suspend our activities in Abi-Adi, Adigrat and Axum towns of Tigray.”
British Embassy in Addis Ababa said 353,000 people in Tigray are experiencing famine-like conditions.
The Embassy also said vital medicines, food assistance, sanitation supplies, and fuel are all blocked from entering Tigray and urges all to allow urgently needed aid into the region.