What caused stampede-like situation during Rath Yatra in Puri?  

During the Rath Yatra in Puri, a stampede-like situation occurred due to overcrowding on chariots and lax cordon systems, resulting in the death of a devotee and several injuries.

Devotees throng Puri grand road

Despite preparatory meetings, mock drills, guidelines and massive security arrangements, a stampede-like situation occurred during chariot pulling, resulting in the death of a devotee and several others suffered injuries on Sunday. 

Why this happened? Who is responsible? Many such questions are being raised.