Two Hamas terrorists were killed on Tuesday when an Israel Defense Forces' tank returned fire after being attacked during a patrol.
The "Great March of Return" protests sought the right of Palestinian refugees and their descendants, who according to the United Nations make up around two-thirds of Gaza's population, to return to their homeland inside what is now Israel.
Following a meeting with other resistance factions, al-Masri told reporters that the Palestinian resistance would "not allow Israel to breach the terms of the truce".
Hamas' military wing, the Ezzedine al-Qassam Brigades, confirmed in a statement that the dead men were its fighters and named them as Ahmad Murjan and Abdel-Hafez al-Silawi.
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"The resistance can not allow the occupation to impose a policy of bombing sites and targeting fighters without paying the price", it said in a statement.
The military released footage that it said was of the incident.
The ongoing popular demonstrations have been violently suppressed by Israeli forces, who have killed 160 Palestinians and injured over 17,000 more, according to numbers from the Gaza Ministry of Health. Sources said that Hamas is unwilling to enter into any negotiations or provide any information about the Israeli soldiers detained, agreeing only to a prisoner exchange in return for the freeing of prisoners rearrested after the Gilad Shalit deal in 2011.
Since 2014, Hamas has held four Israeli soldiers, two of whose fate is unknown.