Four men from Birmingham have been charged with terrorism offences.
Khobaib Hussain, Ishaaq Hussain and Shahid Kasam Khan, all aged 19, and Naweed Mahmood Ali, 24, were remanded in custody by Westminster Magistrates.
They are accused of collecting money for terrorism, travelling to Pakistan for terrorism training and travelling abroad to commit acts of terrorism.
The men were arrested in the Sparkhill area of Birmingham on Tuesday, West Midlands Police said.
They have been charged with engaging in conduct in preparation of terrorist acts contrary to section 5(1) of the Terrorism Act 2006, a force spokesman said.
A West Midlands Police spokesman said: "These charges are in connection with Operation Pitsford, a major counter terrorism investigation that has already seen eight people charged and appear in court."
A force spokesman said eight other people had already been charged in connection with the investigation.
Seven of those are currently on remand after appearing in court.