Members of the Brussels-based group are believed to have received terrorist training in other countries besides Pakistan . Return of alleged Western militants to Belgium sparked Belgian antiterror protests . Documents indicate U.S.-born militant passed details of New York transit to al Qaeda . Recruits allegedly chatted about potential targets while in transit . Such incidents illustrate al Qaeda 's continued desire to inflict mass casualties .
Return of alleged Western militants to Belgium sparked Belgian antiterror protests . Documents indicate U.S.-born militant passed details of New York transit to al Qaeda . Recruits allegedly chatted about potential targets while in transit . Such incidents illustrate al Qaeda 's continued desire to inflict mass casualties .