If Farman's nerve failed or something went wrong, Abdul Quboshi's job was to press the detonator.
Karadzhova said the bomber either pushed the detonator by mistake, or that somebody triggered the explosives remotely.
In the picture, DJ Pam is holding two sticks while Riley holds what appears to be a detonator.
They discussed chemical formulae, quantities of chemicals, syringes to be used to create a detonator, glue and drinking straws.
BBC: Terror trial: 'Suicide bombers ready to take on England'
The bombs were triggered by a remote detonator of the kind used in remote-control toys, U.S. officials have said.
Network Rail has been criticised after a teenager lost the sight in his right eye when a railway detonator exploded.
Bomb disposal experts found between 24 pounds (10 and 12kg) of explosives connected to a detonator with a 440-foot (135-meter) cable.
The Office of Rail Regulation said some detonator storage at the Essex depot where the explosives had been taken from was unsuitable.
As the gang left, they again threatened to burn the house down and set off a bird scarer detonator in the house, which was filled with smoke.
Saudi officials believe that the prince's assailant exploded the 100-gram device using a detonator with a chemical fuse, which would also not be detected by a metal detector.
CNN: Analysis: Similar explosive on plane used in Saudi attack
It is, as I said on Newsnight last night, like pass the parcel with a stick of financial Semtex: Greece as the detonator, Italy as the explosive mass.
"The device contained two blue barrels with 125kg of homemade explosives in each one, and a detonator -- all the equipment which meant this device was ready to go, " he said.
Numerous market participants have told me that it is fear of that being the trigger - the detonator more like - of the unexploded mass of bad debt in Spain that is haunting them.
Indeed, it points to such laudable projects such as a low-cost, wind-powered land mine detonator -- not exactly the kind of thing one would pick up on the next Target run (even on sale).
ENGADGET: Switched On: Higher stakes, higher ground for crowdfunding, part 1
"We were surprised by the announcement of said inspection on the part of the private channel Globovision, social networks and the website of the El Impulso newspaper, which without any doubt was a detonator for the violence, " it said.
In a 2011 ruling, Duffy wrote that while Yousef was awaiting trial, he had been trying to collect urea -- a component of urine -- and a type of watch that had been used in a detonator in the airline bomb plot.
We saw a number of Electric Imp demos and appliance ideas at the booth including a simple hand-held "detonator" toggle switch with LED, seven-segment counter, water level sensor, servo-controlled gauge, RGB light, power socket, Christmas light, power monitor, toy washing machine, 16x16 LED display and receipt printer (the latter two being combined to show the avatars and tweets of anyone mentioning the Electric Imp) -- all Internet aware.
ENGADGET: Hands-on with the Electric Imp at Maker Faire (video)
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