Four people are due to appear in court on Friday after being charged with terror offences.
The quartet were arrested on August 26 by West Midlands Police's counter terrorism unit.
Naweed Ali, 28, and Khobaib Hussain, 24, both of Sparkhill in Birmingham, and Mohibur Rahman, 31, and Tahir Aziz, 37, of Stoke-on-Trent, are due to appear at Westminster Magistrates' Court in London on Friday.
They are charged with preparing for terrorist acts, contrary to section 5 of the Terrorist Act, West Midlands Police confirmed.
A fifth man, 18, who was also arrested last month, has been released without charge.