I suppose it depends on what grounds the police and intelligence services deemed him suspicious. If they had tracked him over the internet, then perhaps terrorists use the same shady offsite file stores as paedophiles, hence the police go in expecting to find a terrorist and find a kiddyfiddler instead. The presence of these pictures might also explain why an "innocent" man allegedly put up such a fight and got his brother shot. Just speculation and wild at that - but until the police investigation of the incident is completed there is nothing but speculation and heresay. The police apology was aimed mostly at calming the local community and shouldn't be over-interpreted.