Mr. Goburdhan has placed great emphasis on the fact that as the four witnesses who had reached the place of incident i.e. Jora Singh, Satnam Singh, Gurdeep Singh and Kulwant Singh had resiled from their statements and had disowned their initial stories, the prosecution had of necessity to rely on circumstantial evidence and if the chain of circumstances remained incomplete or even if one link in the chain was broken, the prosecution must fail