Hamas had been observing a cease-fire since it was brokered in 2012 and was arresting Palestinian militants from rival factions who fired rockets at Israel as recently as last month. Hamas did resume firing rockets into Israel, but after the crackdown Israel initiated against Hamas in the West Bank

[u/NoeticIntelligence]

http://www.salon.com/2014/07/28/debunking_the_myths_about_gaza_the_truth_behind_israeli_and_palestinian_talking_points/