On yesterday afternoon,Mrs He left home to go shopping.Halfway down the stairs,she found her way blocked by two men,who were armed with knives and threatened her.They said they would stab her if she made a noise.Then,they forced her to take them to her flat and open the door.
     In the flat opposite,a woman heard the noise outside.When she looked out through the window,she discovered that her neighbour was threatened by someone.She immediately called the police station.In answer to the call,a patrol police car arrived at the scene of the crime quickly.Three policemen went inside the flat,others guarded outside the building to prevent anyone from escaping.
      The two criminals were arrested.They were taken to the police station with their wrists handcuffed.There they would be questioned and probably charged with robbery.