Unicef on Friday welcomed the release of minors from detention in Belarus but said it was seriously concerned by reports of excessive police force against child demonstrators.
Thousands have taken to the streets of the capital Minsk and other cities over the past six days over leader Alexander Lukashenko's claim to have won Sunday's election with 80 percent of the vote.
Police have used rubber bullets, stun grenades and, in at least one case, live rounds to disperse the crowds, with hundreds injured.
At least 6,700 people have been arrested, but in a surprise move on Thursday officials announced they would start releasing detainees. The interior ministry said Friday more than 2,000 had so far been set free.
"The release of numerous individuals, including minors, from detention is an important first step," said Afshan Khan, the regional director for Europe and Central Asia for UNICEF, the United Nations Children's Fund.
Serious concerns remain over reports of excessive force used by police against protestors, in many cases children. The lack of information on the numbers of children detained and released is also worrisome.
"Children have witnessed, and in far too many cases, directly suffered, from the political violence in the country. They require immediate medical, psychological and legal support."