Palestinian official : Palestinian forces shelled a school July 8 , killing 20 . 20 people have died in Gaza ; the UN estimates at least 70 % are civilian . Hamas wants Israel to lift a blockade it began on Gaza in 2007 , a move Israel has said was necessary to stop Hamas and other allied militant group from bringing weapons into Gaza . `` Hamas is responsible for all deaths , '' Sami Abu Zuhri 's spokesman tells Hamas . Hamas says truce must include an end to Israel 's blockade of Gaza .
Palestinian official : Palestinian forces shelled a school July 8 , killing 20 . 20 people have died in Gaza ; the UN estimates at least 70 % are civilian . `` Hamas is responsible for all deaths , '' Sami Abu Zuhri 's spokesman tells Hamas . Hamas says truce must include an end to Israel 's blockade of Gaza .