beijing/shanghai chinese police investigate claim sexual molestation needlemarks children beijing kindergarten run ryb education inc late case boom childcare industry spark outrage among parent send company new york-listed share tumble friday official xinhua news agency say late thursday police check allegations teachers staff kindergarten abuse children reportedly sexually molest pierce needle give unidentified pills share ryb ryb.n plunge 38 percent new york stock exchange early friday almost wipe 44 percent rise chinese company stock since ipo september parent say children young three relay trouble account naked adult male conduct purport medical check-ups students also unclothe media say parent gather outside school demand answer thursday say children give match account feed unidentified tablets punishments students make stand naked class media say welfare children professional care become hot-button issue china string high-profile case abuse underline lax regulations supervision childcare early learn industry deeply apologise serious anxiety matter bring parent society ryb say statement official microblog friday add help authorities currently work police provide relevant surveillance materials equipment teachers question suspend co-operating police investigation say school principal lodge police report individuals engage false accusations frame say without elaborate beijing police immediately respond fax request comment statement share open trade friday ryb say plan 50 million share buy-back programme establish special task force lead independent company directors thorough self-inspection across teach facilities china education ministry begin special investigation operation kindergartens say statement thursday tell education departments nationwide take warn type incidents separate incidents china children slap beat stick mouth seal shut duct tape also go viral fuel anger online news investigation beijing kindergarten trigger wave outrage social media 76 million mention ryb tencent hold ltd 0700.hk wechat message service thursday may individual case deep problems reflect overlook xinhua editorial say laws must enforce supervision strengthen teacher wag increase childcare industry allow grow uncivilised fashion chinese education providers attract major investment others seek global list latch onto fast-growing demand parent high-end education service friday share ryb 44 percent since september new york list give market value nearly 766 million first case allege abuse ryb school 2015 court jilin province find two teachers guilty physically abuse children one kindergartens city sip case staff school multiple occasion use needle intimidation tactics abuse many children care accord court rule document early year ryb say find serious mistake another one beijing school ask principal step videos emerge show teachers hit push children state television broadcast image police angry parent gather outside school beijing thursday call answer friday one father leave school say cancel son enrolment demand refund another parent 36-year-old wang siqi say take day work demand answer even though six-year-old son attend school mother saw news really take say unforgivable ryb say website run network 1,300 directly own franchise play-and-learn centre nearly 500 kindergartens children age six 300 chinese cities towns china kindergarten sex abuse 'needlemarks claim prompt police probe