In response to the Goldstone report that made vague references to some rockets being fired into someplace in Israel from somewhere nearby, but didn't actually name the people firing the rockets , or give victims' accounts; Hamas have defended themselves and claimed that the rockets were not directed at civilians.
HRW said Hamas' claim was "belied by the facts", of which there are plenty, not least on the IDF's YouTube channel (link on the right). The whole scenario is so ridiculous; Hamas with their laughable claim that Israeli civilian casualties were accidental, and HRW actually addressing their "report", humouring them the way you would humour a child who's drawn a not-very-good picture and tell them "Well done! But the nose shouldn't be on the forehead."
In between the Guardian taking this opportunity to try and say that HRW isn't biased against Israel, and look it's all just a Zionist conspiracy to stifle criticism, it (the Guardian) manages to throw in right at the end HRW's grievance at Hamas launching rockets from populated areas in Gaza, which endangers the Palestinians "by raising the likelihood of Israeli retaliation
Strangely enough, that was just before Cast Lead when there were no Israeli military targets in the area.