PHILADELPHIA (CBS) -- Police are looking for surveillance video in two separate stabbings that happened in North Philadelphia overnight.

In the first incident, investigators say someone stabbed a man on Allegheny Avenue near Front Street, before 11 p.m. 

The victim, believed to be in their mid-20s or early 30s, is in critical condition after surgery.

Another stabbing happened around 11 p.m. at 5th and Luzerne Streets.

Investigators say a suspect stabbed a 31-year-old woman and had once been in a relationship with her.

She's now in critical condition at Temple University Hospital with multiple stab wounds.