The Metropolitan Police have charged five people with terrorism offences following their arrest in operations carried out earlier this month.
Police charged three men from London with preparing for acts of terrorism and one woman with possession of a document likely to be of use to a terrorist.
All four were arrested between July 5 and 7.
A fifth man was arrested in east London on Wednesday and later charged with three counts of possession of terrorist material.
All five will appear at Westminster Magistrates' Court later Thursday.
The three men charged Wednesday were named as Richard Dart, 29, Imran Mahmood, 21, and Jahangir Alom, 26. The woman was identified as 22-year-old Ruksana Begum.
The three men are accused of travelling to Pakistan for training in terrorism and travelling abroad to commit acts of terrorism.
The fourth man, 47-year-old Khalid Baqa, is charged with three counts of possession of terrorist material and one count of dissemination of terrorist material, all dating from July 5.
With the Olympic Games due to start in London on July 27, Britain's security threat level is currently set at "substantial", meaning officials believe there is a strong possibility of a terror attack.