A park-keeper has told a court he found a homemade bomb allegedly dumped by one of the men accused of plotting an attack in London on 21 July 2005.
Jackie Whitcomb told Woolwich Crown Court how he discovered the package in Little Wormwood Scrubs Park, west London, and sealed off the area.
Prosecutors claim the device was left there by Manfo Asiedu, who "lost his nerve" at the last minute.
Mr Asiedu, 33, and five others deny conspiracy to murder.
All six men also deny a charge of conspiracy to cause explosions.
They are accused of attempting to carry out suicide attacks on London's transport network.
Mr Whitcomb told the jury how he was clearing litter in the park on 23 July when a white container in the shrubbery caught his eye.
"It stuck out quite a lot. I didn't realise what it was."
Muktar Ibrahim, 29, from Stoke Newington, north London
Ramzi Mohammed, 25, from North Kensington, west London
Yassin Omar, 26, from New Southgate, north London
Hussein Osman, 28, of no fixed address
Manfo Asiedu, 33, of no fixed address
Adel Yahya, 24, of High Road, Tottenham, north London
He said he bent down and picked it up but "saw the nuts and bolts on it and slowly put it down and briskly walked away".
Colin Goodson, a police explosives officer, was called to the park shortly afterwards.
Giving evidence, he said the device was still intact when he arrived and there were wires coming out of the bottom - but he managed to dismantle it.
Mr Goodson said he ran tests on the bomb and was satisfied at the time that he was "dealing with a viable device".
Earlier, the jury watched CCTV footage said to show the moment another of the alleged conspirators tried to set off a bomb on a bus.
The prosecution say Muktar Ibrahim was caught on camera trying to detonate explosives on a number 26 bus in Shoreditch, east London
The other defendants are Hussein Osman, Ramzi Mohammed, Yassin Omar and Adel Yahya.
The trial continues.