A 17-year-old boy has been arrested after three people, including a child, were attacked with a "sharp object believed to be broken glass" at a school in northern England, police said.
The teenager was detained on suspicion of attempted murder after the attack at The Birley Academy, a community college in Sheffield, South Yorkshire.
South Yorkshire Police assistant Chief Constable Dan Thorpe said officers arrested the boy at the school "within minutes of the initial call" at around 9am today.
Two adults suffered minor injuries - one from a "sharp object believed to be broken glass" - but did not require hospital treatment, he said.
The child assaulted had no visible injuries, he added.
The school said that it went into lockdown following the violence, before closing for the day.
British Education Secretary Gillian Keegan said: "We're in touch with the school and my thoughts are with those injured and all the school community affected by this frightening situation".
The attack came days after a similar incident in southwest Wales.
Two teachers and a pupil were stabbed at a secondary school in Ammanford, north of Swansea, last Wednesday.
A 13-year-old girl has been charged with three counts of attempted murder.
