Three men are due in court charged with terror offences in connection with an alleged plot to bomb aircraft.
Fourteen people have been charged over the alleged plot
Mohammed Shamin Uddin, Mohammed Yasar Gulzar and Nabeel Hussain, 22, were charged on Tuesday with conspiracy to murder and terrorism charges.
All three are due to appear at City of Westminster Magistrates' Court on Wednesday, Scotland Yard said.
Five people remain in custody, eight men have already been remanded and three others are facing lesser charges.
They were all arrested after a series of raids in London, Birmingham and High Wycombe, Bucks, overnight on 9 August.
Officers have until Wednesday to question five other people still being held, after which time they may charge or release them or apply for a further extension.
Police allege that Mr Uddin, Mr Gulzar and Mr Hussain, between 1 January and 10 August 2006, conspired to murder other persons.
They are also accused of planning to intend "to smuggle the component parts of improvised explosive devices onto aircraft and assemble and detonate them on board" contrary to section 5 (1) of the Terrorism Act 2006
Mr Hussain's brothers, Mehran and Umair, are among the three people facing less serious charges.
They have been accused of failing to disclose information about Nabeel Hussain's alleged activities.
Cossar Ali - a 23-year-old mother of an eight-month-old baby from Walthamstow, east London, made a second court appearance on Tuesday accused of failing to disclose information.
A 17-year-old youth - arrested by police investigating the alleged plot - also appeared at City of Westminster Magistrates' Court for a second time.