This is in addition to Monday’s arrests of 1,000 people near the capital.
A six-month state of emergency has been declared in the face of a wave of unprecedented anti-government protests.
Under the emergency measures, people can be detained without an arrest warrant for the duration of the state of emergency.
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It describes all those arrested as “suspects in the recent violence” and adds that a large number of looted weapons have also been handed over.
There is no mention as to where the people are being held.
Rights groups say that at least 500 people have died during the anti-government protests over the last 11 months as a result of clashes with security forces.
Prime Minister Hailemariam Desalegn said last week that could be an accurate estimate, but blamed “anti-peace forces” for the trouble.
Activists have targeted commercial property, including some foreign-owned businesses.
That plan has since been dropped, but the protests have continued.
There have also been demonstrations in the country’s Amhara region.
Activists blamed the security forces for causing the panic, but the government said protesters in the crowd were responsible.