The government of Ethiopia has declared three days of national mourning for the more than 50 people who died in a stampede at the Irreecha celebration in Bishoftu town, 40km southeast of the capital, Addis Ababa.
The stampede happened in the Oromia region which has been wracked by anti-government protests for almost two years.
Flags are being flown at half-mast across the country and in its foreign missions.
At the annual cultural event, attended annually by hundreds of thousands of people, the celebration turned deadly on Sunday when police reportedly fired teargas and warning shots to disperse anti-government
The teargas caused panic and triggered the stampede in which, according to officials, 52 people were killed.
Witnesses, however, have claimed more than 100 people lost their lives.
Videos showed people fleeing and falling into deep ditches.