But Nega said Wednesday that "close to 1,000" had been arrested and most were peaceful critics Online Cigarettes Store USA of Abiy's government. AFP was unable to independently verify this claim.
"We have prisoners of conscience now," he said.
"The world should recognise that people are being locked up right now as political prisoners, prisoners Newport Pleasure of conscience, and the world should give us their support."
A government spokeswoman did not immediately respond to a request for comment.
Nega's press conference was disrupted by half a dozen young men brandishing Ethiopian flags who called him a liar and accused him of stoking tensions among ethnic groups.
But Amnesty International researcher Fisseha Tekle also told AFP Wednesday that the total number of those arrested was higher than the government has reported.
"The government is affirming that Newport box 100s cigarettes they've arrested 250 related to the coup, but much more have been arrested for their perceived political views and activities," he said.
On Tuesday, Amnesty and the Committee to Protect Journalists issued statements warning of threats to the Ethiopian press.
Amnesty reported that two journalists had been arrested and charged under controversial anti-terrorism legislation "which was used by previous governments to bring trumped-up charges against its critics".