All classes in the kindergarten have been suspended since Nov 9.
The operations of the day care center is managed by a company called Modern Family Magazine. The Shanghai Women's Federation, which is the shareholder and direct supervisor of the company, announced on its official Weibo account on Thursday that it will "deal with the incident seriously and strengthen management of its subordinate units."
The federation also said that the day care center has sacked the four suspects and apologized to the families of the affected children.
On Nov 8, the top management of Ctrip apologized over the incident and said it would continue assisting the police in their investigations.
"On behalf of the company, I extend my sincere apologies to the involved families and children," said Sun Jie, CEO of Ctrip.
According to Sun, Ctrip has also set up an investigation team which will review the day care center's surveillance footage in the past three months.