Marchers from the international organization Pour Mere Terre (For Mother Earth) were led away by police as they staged a small demonstration in front of Gorky Park, close to the French Embassy in Moscow.
Members of the group -- which left Brussels nine months ago to the day --issued a statement saying 16 activists had been released, adding that three are to stand trial Friday.
"We intend to finish our walk on Red Square as planned. Hopefully the Moscow police won't disturb us again," said Pour Mere Terre's Moscow representative, Pol d'Huyvetter.
He said the march was aimed at drawing attention to the interests of peoples in regions where nuclear powers carried out test blasts.
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