"He wanted to kill the policemen in the van," the sources said.
Bhatkal could not find the vehicle on the fateful day after which he planted the fourth explosive in a nearby dustbin, which failed to blow up, they said.
Three powerful blasts had ripped through crowded areas in Mumbai on the evening of July 13, 2011, killing at least 21 people and injuring 141.
Interrogation of Bhatkal has revealed that the home-grown terror group had actually planted four explosives at four spots, but the fourth bomb, placed in a dustbin near a crowded flower market at Dadar (East) area, did not go off.
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"Bhatkal and wanted accused Tehseen Akhtar Shaikh, who carried two explosives with them, had plans to attach a bomb to a police van usually stationed near the flower market at Dadar (East).
However, the unexploded bomb was never found, the officer said adding that, "It might have been lifted away along with other waste by the garbage trucks."
On Wednesday, Bhatkal and his aide Akhtar were arrested here by the ATS in the 2011 Mimi terror attack case after being brought to the city from New Delhi. The two were produced before a MCOCA court yesterday, which remanded them to ATS custody till February 18.