Magen David Adom emergency medical services said a man and a woman were evacuated from the Barkan industrial zone in critical condition.
Israel's Prime Minister Benjamin Netanyahu on Sunday reportedly told his cabinet that a military operation in Gaza would be imminent should violent tensions worsen.
At the United Nations, Israeli Ambassador Danny Danon memorialized the victims after the Security Council refused to condemn the attack.
The Palestinian Islamic Jihad resistance group said it was a "natural response" to Israeli crimes in Gaza, occupied Jerusalem and Khan Al Ahmar, a bedouin village in the West Bank slated for demolition.
Seven Arabs were arrested in Samaria early Tuesday in connection with the murders of 29-year-old Kim Levengrond Yehezkel and 35-year-old Ziv Hajbi, as well as the wounding of 54-year-old Sara Vaturi, at their workplace on Sunday morning. (Emphasis added.) In fact, officials rightly characterized yesterday's attack in the Barkan industrial park, in which a Palestinian gunman fatally shot two Israeli civilians and wounded a third, as a terror attack, not a militant attack.
Lewis Hamilton roars to Japanese GP pole, horror run for Vettel
Hamilton was supreme, driving superbly and overshadowing Bottas in what has become in recent races a dominant auto . Mercedes' Lewis Hamilton cruised to victory to take another major step towards his fifth Formula One world title.
The Israeli army has launched a manhunt for the attacker.
Some Israeli media reported the Palestinian suspect had been recently fired from his job at the site, raising speculation the attack may have been motivated by a personal vendetta.
Israeli security forces at the scene of a shooting attack in the Barkan Industrial Park area October 7, 2018.
More than 50 Israelis and several foreign nationals have been killed since late 2015 in a series of stabbings, shootings and car-ramming attacks, predominantly by Palestinians or Israeli Arabs.
The last Gaza war in 2014 took place after a series of events that began with the murder of three Israelis hitchhiking in the occupied West Bank. The settlements are considered illegal under worldwide law, though Israel disputes this.