Delays on the underground

Police are finally beginning to release names of those who died in last Thursday's attacks. There have been lots of reasons cited for the delay in reporting who has died: a complex judicial system, the difficult conditions investigators are working in, a necessity to get the details absolutely right, the condition of the remains. All of these are, I'm sure, valid. But it is also worth remembering that Madrid suffered from many of these conditions too and had identified almost everyone within three days. So why is it taking so long here?
I would suggest that this is because for every DNA check, there's a police and security service background check to go alongside. This takes some time. Any person on each underground train and particularly on the bus could potentially have been implicated in the attack. My colleague who was on an underground train passing the one that exploded near Liverpool Street was interviewed by police after having stood in the carriage for an hour waiting to be rescued, then being led back up the tunnel. And can you imagine the police turning around to the relatives of the deceased and telling them that they just want to make sure the person who's missing isn't a terrorist?
Similarly, if we look at the delays between the bombs going off at 8:51 and rescue teams arriving on the scene around 9:20, this can be explained by police uncertainties. Emergency services could certainly have reached the scene in a third of the time. But if a bomb goes off, particularly in a confined space, who is to say that there aren't further devices targetting the rescue teams? This has certainly been a system used across the world by many organisations. Or worse still, that the bomb is a "dirty" device, including anthrax or something similar to spread longer term damage and impede access. But could the police tell the public that if they are victims of a terrorist attack they'll need to wait half an hour before anyone comes to rescue them while they check out the safety of the emergency scene? That people will die who could have been saved while all due diligence is performed?
Amid the unspeakable acts, there remain resolutions that are unspoken.