According to another counter-terror investigator, it was probably the absence of a safe haven in Patna that led the accused persons to carry the bombs in assembled form to Patna.
"In such operations, the usual modus-operandi is to attach batteries to the bombs at the last minute to make them operational," said the source.
While IM's absconding Tehseen Akhtar has been identified as the key orchestrator of the blasts, Maharaj said the "exact role of Pakistani operative Waqas and IM's chief Riyaz Bhatkal is still being worked out".
Akhtar is suspected to have been at the rally's venue at Gandhi Maidan on Sunday and his phone number was found from Ansari, said another source.
According to Maharaj, the preliminary interrogation of an arrested accused Imtiaz Ansari has indicated that members of his module were "involved in the Gaya blasts."
There were similarities in the types of the bombs used in the Patna blasts and the July 7 Bodh Gaya blasts, including the use of identical timer device. The Patna bombs were also similar to those used in the December 2010 blast at Varanasi's Dashashwamedh ghat that was allegedly orchestrated by the IM.