A 38-year-old man is in a stable condition in Altnagelvin Hospital in Derry after being severely beaten in the city last night.
Two men have been arrested in connection with the attack which happened on John Street at around 8.40 p.m.
At least three people struck the man on the head as he passed them and then set about him. The victim sustained "serious head wounds". His condition is described as "critical but stable".