Police are hunting for an armed robber who has mugged three women in The Bronx, cops said last night.

The thug, in his 40s, follows his victims into the elevator, then flashes either a knife or an ice pick and demands they fork over their possessions, cops said.

He first struck on Nov. 10 at 12:15 a.m. inside a building on Alcott Place near Asch Loop in Co-op City.

He then robbed two women within 10 minutes in two seperate buildings on Sunday afternoon, also in Co-op City, cops said.

None of the women were injured.