An Islamist cell tried to carry out suicide bombings on London's transport system just two weeks after attacks that killed 52 people and wounded about 700, a court heard today.
The "extremist Muslim plot" was not a hastily arranged copycat scheme but a long-planned operation, chief prosecutor Nigel Sweeney said as six British men went on trial over the failed attacks of July 21st, 2005.
He said the attackers aimed to cause maximum injury by detonating homemade bombs packed with metal, which they carried in rucksacks onto the public transport system.
"It was simply the good fortune of the travelling public that they were spared," Mr Sweeney told the court.
The targets - three underground trains and a bus - echoed those in the deadly attacks by four young British Muslims who blew themselves up in London two weeks earlier, on July 7th, 2005.
The failed attacks caused panic and triggered a huge manhunt, leaving Londoners unclear if they were a botched and quickly assembled attempt to imitate the original carnage.
But Sweeney told the high-security Woolwich Crown Court: "The evidence in this case shows that this conspiracy had been in existence long before the events of July 7th."
The six men are all originally from Africa and in their 20s.
Sweeney said the 9th-floor flat of defendant Yassin Hassin Omar in north London was the bomb-making factory. The detonator was triacetone triperoxide (TATP) and the main charge was held in buckets surrounded by screws, tacks, washers and nuts.
He added that the 5 kg bombs were made of hydrogen peroxide, nail varnish and flour used to make chapatis, or unleavened bread. They were carried in rucksacks with wires connected to the detonators hidden under clothing.
He said that between May 9th and July 5th, the group bought 442 litres of hydrogen peroxide. One supplier sold them 218 litres, nearly half of its total sales of the chemical in that period.
Mr Sweeney said four of the defendants successfully fired their TATP detonators but the main charge failed to explode, possibly because the proportion of hydrogen peroxide was not quite right.
TATP is an explosive chemical which can be made from commonly available household products. Nicknamed "Mother of Satan", it is highly volatile and liable to explode prematurely if subjected to friction, impact or change of temperature.
All the main suspects on trial were apprehended just over a week after the failed attacks.
Muktah Said Ibrahim, Manfo Kwaku Asiedu, Hussein Osman, Yassin Hassin Omar, Ramzi Mohammed and Adel Yahya are all charged with conspiracy to murder. They deny the charges.
The trial is expected to last four months.