Evidence of sockpuppetry?

The article I wrote about Operation Earnest Voice for The Guardian (published this morning) has proved to be very popular, with around 600 comments left on the paper's website by readers. Some of the comments make fascinating reading, but should I be worried by what reader 'pretzelberg' has found? S/he noticed the following five comments:

icurahuman2
'Nothing new here, the Israelis have been doing it for years'

bigishwilly
'nothing new here - israel have been at this for years'

Moonfish
'Nothing new here. The Israelis have also been doing this for ages.'

Simon1Brum
'Israel has been at it for years'

buddha9
'As do the Israeli's who have been doing it for a couple of years'


Is someone trying to take the piss?