A group from the African Union confirms the handover, writes the spokesperson for the Tigrean resistance group TPLF, Getachew Reda, on Twitter.
In particular, the rebels hope that the Eritrean forces that fought on the side of the Ethiopian government, and partially remain in the area, will be withdrawn.
The purpose of the agreement is to end the conflict that has lasted for two years. In addition to the return of weapons, federal authorities are to regain control, and communications with the region are resumed.
Hundreds of thousands of people are feared by the UN and the US to have died in the conflict.