The major company whose kindergarten in Beijing is under investigation over child abuse allegations, has said it is aware of more complaints by parents at some of its schools elsewhere in China.

The comments from company RYB Education on Wednesday came a day after police said they had detained a teacher suspected of using sewing needles to discipline children, though they added that some other claims of child abuse were unfounded.

The New York-listed company, which describes itself as China’s largest early childhood education service provider, said in a statement after the police report: “RYB is deeply saddened to learn about the latest findings in the follow-up report.”

“The company also understands that there have been additional parent complaints regarding other RYB-branded kindergartens and will continue to cooperate fully with the police and other authorities in this matter.”

There have been reports of similar allegations in the northern province of Hebei, close to Beijing. Authorities there are investigating an allegation of child abuse and have “temporarily closed” an RYB kindergarten, they said in a statement on their official WeChat account late on Wednesday.

RYB says it has more than 1,300 play-and-learn centres and nearly 500 kindergartens in about 300 cities in China. Most are run on a franchise model.

The official Xinhua news agency said authorities in the Chaoyang district of Beijing had also formed an investigation team to look into whether there was any negligence by local education officials.

RYB’s shares fell 8.4% in Wednesday trading in New York, following last Friday’s fall of nearly 40%, although they had recovered some ground earlier this week.