Phone-hacking in numbers

Another arrest today, and here's a snippet on the scale of the investigation from The Grauniad:

Scotland Yard's phone-hacking squad is working its way through 300m emails from News International. A total of 120 officers and staff are now working on the investigation after 1,800 people came forward to express fears that they may have been hacked.

UPDATE: It's Mulcaire... very interesting.