"If the criminal attacks against Israeli military and civilians continues, Israeli will respond with even more force," Netanyahu told public radio.
Israel has killed at least 18 people in air strikes on the Gaza Strip, after an anti-tank missile fired from the coastal enclave hit a school bus on Thursday seriously wounding a teenager.
Earlier Hamas spokesperson Sami Abu Zuhri told the AFP news agency that “a truce will be met with a truce” after Barak declared, “If they cease firing, we’ll cease firing.”
Hamas had previously announced a unilateral truce but rockets continued to be fired from Gaza, with the Islamic Jihad group claiming responsibility for attacks on Saturday.
Hamas declared a state of emergency forces for its security forces Saturday.
Turkey on Sunday dubbed Israel’s operations “excessive” and disproportionate”.