An estimated 100,000 people took to the streets of the Ethiopian capital, Addis Ababa, on Wednesday to protest against Islamic extremism, the Associated Press reported.
On Sunday ISIS released a video which purportedly showed the execution of some 30 Ethiopians in Libya.
The demonstrators could be heard shouting "We want revenge for our sons' blood", referring to those beheaded by ISIS in Lybia on Sunday, AP reported.
The men who died at the hands of ISIS reportedly fled Ethiopia to Libya to attempt the perilous crossing of the Mediterranean sea to European shores, according to the Ethiopian News Agency.
The government declared two days of mourning. Prime Minister Hailemariam Desalegn said that even though Ethiopians are fleeing to escape poverty, smugglers are the ones to blame for convincing them to undertake "the death journey," AP reported.