NEW : However , we are more threatened and face more challenges ; therefore , we must maintain proper activity of our security agencies . Israeli network says 'Prisoner X ' shared Israeli secrets with Israel . The man died in an Australian cell in the previous day ; details have not been released . Israeli lawmakers say they 're investigating the case . Ben Zygier warns against `` overexposure '' of intelligence work .
NEW : Israeli network says 'Prisoner X ' shared Israeli secrets with Israel . The man died in an Australian cell in the previous day ; details have not been released . Israeli lawmakers say they 're investigating the case . Ben Zygier warns against `` overexposure '' of intelligence work .