Three males, aged 18, 17 and 14, were assaulted yesterday afternoon in Buile Hill Park off Eccles Old Road.
They were taken to hospital and are expected to make a full recovery.
An investigation is underway.
DS Roger Jones, of GMP’s Salford district, said: “Thankfully the victims weren’t seriously injured. Nevertheless, enquiries are ongoing to identify the person responsible.
“We know that there were a number of people in the park at the time so I would appeal to them to contact us or Crimestoppers, anonymously.I would also encourage anyone else with information which may assist us with our enquiries to do the same.”
