GUWAHATI, Dec 23: A bullet of a .22-mm pistol pierced the CI sheet of Braja Kanta Kumar of Mathuragar, Santipur Hillside under Bharalumukh police station in Guwahati on Friday night. The family members heared the sound but failed to gauge what it could have been. They came to know only this morning that the sound they had heard the previous night was that of a bullet. Now the question is: if the bullet was fired at them or if it fell accidentally on the house. They informed the police of the matter. The police recovered the bullet. Investigation is going on.