Ahmad Mahmud Janjwa, former magistrate Islamabad, told the Anti-Terrorism Court (ATC) in the high-security Adiala Jail that the witness testified that some of the seven accused of carrying out the Mumbai attack had acquired training in the camp of Lashkar-e-Jhanghvi (LeJ) in Mirpurkhas in the southeastern Sindh region.
The accused include mastermind Zaki-ur Rehman Lakhvi, who is currently out on bail and living at an undisclosed location.
The official quoted the magistrate in describing the witness as "important" in the case.
The court adjourned the hearing for September 22 and summoned four more witnesses.
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In 2012, the Federal Investigation Agency had provided details of 350 articles, including life jackets and a pink foam, found in four training camps of the Lashkar-e-Taiba in Karachi, Mirpurkhas and two other places in Sindh to the trial court.
Indian investigators found samples of the pink foam at three sites where attackers planted bombs in Mumbai in November, 2008.
Samples of the pink foam were also found in the boat MV Kuber - that was used by the attackers to travel to Mumbai - in a bag found at the Taj Mahal Palace Hotel and in a rucksack used by Ajmal Kasab, the lone surviving attacker who was later hanged in an Indian jail.
Former Pakistani interior minister Rehman Malik had earlier said the pink foam would be examined, but so far no reports have been submitted in the trial court about what, if any, their role was in the attack.
Lakhvi, 55, secured bail last December and was subsequently released from the Adiala Jail on April 10 after the Lahore High Court set aside the government's order to detain him under a public security act.