Israel 's military tries to warn civilians in Gaza ahead of a raid . But even in an era of precision targeting , the impact of missiles ca n't be restricted to one house in such a densely-populated area . Sometimes a phone call precedes the ` ` " on the roof '' Still , human rights groups say , civilians are being killed in the conflict .
Israel 's military tries to warn civilians in Gaza ahead of a raid . Sometimes a phone call precedes the ` ` " on the roof '' Still , human rights groups say , civilians are being killed in the conflict .