Four Luton men have pleaded guilty to engaging in conduct in preparation of terrorist acts.
Zahid Iqbal, Mohammed Sharfaraz Ahmed, Umar Arshad and Syed Farhan Hussain admitted facilitating, planning and encouraging travel overseas contrary to Section 5 of Terrorism Act 2006.
The men were arrested following a series of anti-terror raids in Luton last year.
All four, aged between 21 and 31, were due to stand trial next month.
At Woolwich Crown Court they also admitted collecting funds for terrorist purposes overseas and downloaded bomb making instructions.