A man is in critical condition and a teenager has been arrested after an alleged stabbing attack in Sydney’s inner west overnight.

Events began about 10.45pm yesterday, when emergency services were called to a park on Chapman Road, Annandale, following reports of an assault.

Police found six men with varying injuries who were allegedly attacked by four other men following an argument.

All six victims were treated the scene by paramedics.

A 21-year-old man was found with stab wounds and was taken to Royal Prince Alfred Hospital in a critical condition.

Four others required hospital treatment.

Police set up a crime scene and launched an investigation.

Following inquiries, a 15-year-old boy was arrested in Annandale about 12.15am.