Terrorist plotters planned to detonate a series of suicide bombs in an attack that could have been bigger than the July 7 atrocities, a court has heard.
Irfan Naseer, 31, and Irfan Khalid, 27, travelled to Pakistan for terrorist training before returning to the UK in July last year, jurors at Woolwich Crown Court were told.
In one conversation, Naseer was heard agreeing that the July 7 attacks had not done enough damage because there were no nails in the bombs.
The two men, along with Ashik Ali, also 27, are accused of being "central figures" in the alleged extremist plot.
Ali told police in interview that the plan had involved him wearing a suicide vest as well as carrying a gun, the jury heard.
The group also discussed the use of poisons and attaching blades to the side of a vehicle before driving it into a crowd of people, it is claimed.
Prosecutor Brian Altman QC told the court: "The police successfully disrupted a plan to commit an act or acts of terrorism on a scale potentially greater than the London bombings in July 2005 had it been allowed to run its course.
"The defendants were proposing to detonate up to eight rucksack bombs in a suicide attack and/or to detonate bombs on timers in crowded areas in order to cause mass deaths and casualties."
All the men are accused of engaging in conduct in preparation of terrorist acts, which they deny.
In total, 11 men of Pakistani and Bangladeshi origin were arrested over the alleged plot, and one woman. The trial continues.