A study published April 2015 by Defense for Children International Palestine found that: "During Operation Protective Edge, Israeli forces relied on unmanned aerial vehicles or drones to carry out attacks in the Gaza Strip. DCIP’s investigation found that Israeli forces killed 164 children in drone attacks showing an increase in the use of drones in Gaza compared to previous Israeli military offensives." page 43 http://www.dci-palestine.org/sites/default/files/operationprotectiveedge.awarwagedonchildren.160415.pdf