Woodstock police are searching for four suspects following an early morning robbery Sunday in which, police say, a knife was used.

They say a male and female were walking on Wellington Street near Main Street when they were confronted by four people.

A male allegedly pulled out a knife and threatened them. The male demanded a backpack and fled once he had it.

Police say the suspect was last seen travelling west toward the railway tracks. The three other suspects fled in a different direction.

The victim was taken to Woodstock General Hospital where he was treated and released.

Police say the incident happened around 2 a.m.

The suspects include two females and two males, between the ages of 16 and 20. The male who fled with the backpack was wearing a white hoodie with black lettering, a blue bandana and hat.