Some 2,000 students at a primary school in Chengdu, southwest China’s Sichuan province have been relocated after dozens of students began to develop symptoms including nosebleed, vomit and dizziness, which are suspected to be due to pollution on campus.

Hundreds of students allegedly began to develop illness after they moved to the new campus of primary school affiliated to Chenghua district institute of education sciences in Chengdu, China Youth Daily (CYD) reported, citing the estimates of parents.

Several parents contacted by the newspaper claimed their first- or second-graders suffered from dizziness and nosebleeds. Some also had erythema on their bodies or had red and swollen eyes. Some were even diagnosed with kidney or liver problems.

“The doctor said there is something wrong with my kid’s lymphatic system and it may because of environmental issue during redecoration,” Xu Qiang, one of the parents, was quoted as saying.

Ye Shuwen, deputy chief of the education bureau in Chenghua district, told CYD some 40 out of 98 students absent from class asked for a sick leave on Monday.

However, countering an online post claiming that the school’s new playground had an acrid smell, Ye stressed that the new campus has gone through a third-party environmental impact assessment which read qualified.

The students were relocated to their old campus on Monday. Ye said the relocation decision is made to guarantee students’ health, but it is yet to confirm the illness is related to the newly-revamped campus.