A man was grievously injured early on Friday when he was attacked in St Julian's.
The police said the incident happened in Triq San Ġorġ at around 1.30am.
The victim, a 25-year-old French man, was attacked by a person who managed to escape before the police arrived.
He was given first aid by a medical team on site and was then taken to Mater Dei Hospital by ambulance.
The police are investigating.