A man has been charged under the Terrorism Act in relation to the failed bomb attacks in London on 21 July.
The 21 July attacks in London failed
Ismael Abdurahman, 23, of Newport Street, Kennington, south-east London, is the first person to be charged in connection with the incidents.
He is accused of withholding information that may have helped catch a person involved in terrorism.
Mr Abdurahman, who was arrested on 28 July, will appear before Bow Street Magistrates' Court on Thursday.
The allegation is understood to relate to the Shepherd's Bush bombing, with suspect Osman Hussain, also known as Hamdi Issac, currently being held in Italy.
Mr Abdurahman was charged with "having information that he knew or believed might be of material assistance in securing the apprehension, prosecution or conviction of another person in the UK for an offence involving the commission, preparation or instigation of an act of terrorism, failed to disclose that information as soon as reasonably practicable to a constable".
Police also said a man held in Brighton on 31 July has been released without charge.
Osman Hussain is suspected of the Shepherd's Bush attack
There are a further 14 people being held over the attacks and in the UK.
Metropolitan Police Commissioner Sir Ian Blair said the 21 July attacks - which also saw explosions at Oval and Warren Street stations and on a bus in Shoreditch - were intended to kill.
Meanwhile there is set to be a massive police presence in London on Thursday, a fortnight since the failed 21 July attacks and four weeks since the deadly 7 July bombs.
A reported 6,000 officers, many armed, will patrol London's streets and transport network.
British Transport Police will bring in extra officers from outside the capital and undercover officers will be on Tube trains and buses in an effort to spot any bombers.
Meanwhile, the British Embassy in Rome has insisted reports that the British police are unhappy with the level of co-operation from the Italian authorities are untrue.
One of the Italian investigating magistrates, Pietro Saviotti, told state radio RAI: "The process for extradition is on course and at the same time we are carrying out careful checks to verify any possible crimes committed in our state. I believe these two requirements are perfectly compatible.
"I would not say we are talking about days, but about weeks before Issac can be extradited."