The girls suffered minor injuries and were released from hospital over the weekend.
The boys, aged between 12 and 16, entered a field near the school in the village of Darpakha, about 180 miles from the state capital, Patna, where the girls were playing on Saturday and shouted obscene comments, Choudhary said.
The boys left after the girls protested, only to return later with a group of around 20 people armed with sticks.
“The boys brought their mothers and others from the neighbourhood,” Baidyanath Yadav, Supaul’s district chief, told Reuters. The older women also attacked the girls, he said.
Yesterday the girls returned to school, where authorities have beefed up security, Yadav said.
Opposition leader and former Bihar deputy chief minister Tejashwi Yadav took to Twitter to target Chief Minister Nitish Kumar, accusing him of maintaining a “cunning silence” on the violence.