Four were charged with preparing for an act of terrorism, and two more with failing to disclose information, the police said. One of those two was also charged with terrorist fundraising, the report said.

The police said Irfan Nasser, 30, Irfan Khalid, 26, Ashik Ali, 26, and Rahin Ahmed, 25, were charged with plotting terrorist acts. They were involved in planning between Dec. 25, 2010 and Sept. 19 of this year to prepare or help others prepare to commit acts of terrorism, the department said.

Nasser and Ali are alleged to have planned a bombing campaign; stated an intention to be a suicide bomber; collected money for terrorism; made or helped others make a bomb; and recruited others for terrorism, the report said.

Nasser and Khalid are also accused of traveling to Pakistan for terrorism training including bomb-making, weapons and poison-making, as well as making a martyrdom film, the report said.

Ahmed is accused of helping others travel to Pakistan for terrorism training, collecting money for terrorism and investing and managing terrorist funds, the report said.

Ashik Ali's brother Bahader Ali and Mohammed Rizwan are both charged with failing to disclose information about acts of terrorism, police said. Bahader Ali is also charged with terrorist fundraising, the report said. A seventh Birmingham man, aged 20, who was arrested last week, is still being questioned.