At around 8.50pm on Monday 25 May 2020, police were called by the ambulance service responding to reports of an assault at the Oak Road shops, Partington.
Officers attended and sealed off the immediate area.
A 29-year-old man was taken to hospital.
An 18-year-old man has been arrested on suspicion of wounding with intent to do grievous bodily harm.
An investigation is underway.
Anyone with information should contact police on 101 quoting 3285 of 25/05/20 or the independent charity – Crimestoppers, anonymously, on 0800 555 111.