Two schoolchildren were wounded by a man in a school in Berlin's Neukölln district on Wednesday, with one critically injured and the other seriously injured, according to a police spokeswoman.
The man suspected of carrying out the attack was detained at the scene.
Police were investigating what led to the crime that occurred at around 3 pm (1300 GMT) but did not provide further details.
The local BZ newspaper reported that a 7-year-old and an 8-year-old had been stabbed.
The perpetrator was waiting for the police at the school, the report said.
The school was evacuated and the surrounding area cordoned off by the police.
A homicide squad is investigating.
