A robbery in Flushing, Queens turned into a stabbing spree on Tuesday -- leaving three people wounded.
Police arrested a suspect, but have not yet determined what caused him to go on the violent spree.
One victim is in serious condition and two others are in stable condition at a nearby hospital.
The stabbings happened at a apartment building at 147-15 Northern Boulevard.
Police said a fourth person was punched in the face, but not stabbed.