The girls, aged 7 and 8, were flown to a hospital. One of them had life-threatening injuries, according to a Berlin police statement.
The attack took place in the playground of the Protestant School in Berlin’s Neukoelln district on Wednesday, principal Thorsen Knauer-Huckauf said.
“The entire school community is deeply affected and shocked,” he said in a statement.
Berlin Mayor Kai Wegner condemned what he described as an “incomprehensible deed.”
“My thoughts in these difficult hours are with the two wounded girls,” he said.
Read Related Also: Does Maxine Die In Hollyoaks? Where Is Nikki Sanderson Going After Leaving Hollyaks?
“I wish them a speedy and good recovery.”
The head of Berlin’s state education department said authorities don’t have any indication that there was a political or religious motive behind the attack.
Police declined to immediately provide further details about he suspect, saying only that he would be interviewed as part of a homicide investigation.
Entire football team killed when plane crashes into church