An ongoing British counter-terrorism investigation netted the arrests of four young men in raids early Tuesday. At least 12 people have been apprehended during the past three months in "Operation Pitsford." The latest suspects were picked up for raising funds for violence and planning travel to Pakistan for terrorist training.

"Today's arrests were pre-planned and not made in response to any immediate threat to public safety. Officers were unarmed," said a statement from the local British police detachment. The four are being held under Britain's Terrorism Act 2000, which gives investigators 48 hours to charge, release, or apply for additional detention time to detain the suspects.

In September, authorities nabbed three suspected suicide bombers before they went operational. The group is reported to have planned "mass murder" on the streets of Britain, and made "martyrdom" videos stating their intentions.