Rockets were already fired at Israel from Gaza, but Hamas was seeking a popular uprising.
In a video, children appear to be dressed as militants, re-enacting recent clashes in the contested city.
The militant group hanged two men and killed a third by firing squad on Thursday.
The Israeli leader says Hamas has not changed its stance after attempt to soften image.
Hamas has blamed Israel for the killing of Tunisian engineer Mohamed Zaouari.
These executions are the first death penalties carried out in the coastal territory since 2014.
Mohammed Deif, survivor of numerous Israeli assassination attempts, is again involved in the militant group's decision-making.
The U.N. also blamed Hamas for putting other U.N. schools at risk by storing weapons inside them.
The Palestinian authority is seeking an inquiry into last summer's Gaza conflict, a move deeply opposed by Israel.
Rights group says Israeli actions during conflict do not justify direct and indiscriminate attacks on civilians.
The IDF opens six criminal investigations into its conduct nine months after Gaza conflict.
The report by Physicians for Human Rights was based on testimony from hospital patients.
The programme aiding over 100,000 people made homeless will be suspended after donors pulled out.
Nabil has lost his arm, his wife, two daughters, two sons, two brothers and six other family members
Amnesty International said that Israeli forces showed a "shocking disregard for the lives of Palestinian civilians" and "brazenly flouted the laws of war."