Belgian counterterrorism official tells CNN how they thwarted an ISIS cell . But the official told CNN investigators believe the group planned a much more ambitious and spectacular attack with police just being a `` bonus target . '' January 15 was the biggest firefight Belgian commandos have faced since World War II . The group had been planning to attack a Brussels airport and subway system, but instead blew themselves up in a metro station on Tuesday.
Belgian counterterrorism official tells CNN how they thwarted an ISIS cell . January 15 was the biggest firefight Belgian commandos have faced since World War II . The group had been planning to attack a Brussels airport and subway system, but instead blew themselves up in a metro station on Tuesday.