NEW : `` Violent repression by security and military forces must end immediately , '' Ban says . NEW : A Syria -based Muslims group says tens of thousands are dead Friday . Protesters in London dedicate nearly three months 's marches to children . Interviews are currently being conducted with these and other returnee families to better understand their reasons for return and their future intentions . '' Children have died during the demonstrations , groups say .
NEW : `` Violent repression by security and military forces must end immediately , '' Ban says . NEW : A Syria -based Muslims group says tens of thousands are dead Friday . Protesters in London dedicate nearly three months 's marches to children . Children have died during the demonstrations , groups say .