A manager at another company in the industrial zone, Moshe Lev-Ran, suggested the attack might not have been politically motivated. "We know that he is still armed and is considered unsafe", Conricus said.
P.A. TV's Israel Affairs expert Fayez Abbas accused Israel of incitement for defining the murder as a Palestinian terror attack, asserting falsely, that there were doubts about the motive for the murder.
A series of rallies in Gaza against Israel's siege of the territory since March have given rise to nearly weekly scenes of death on the border as Israeli snipers have picked off protesters.
Speaking at Barkan, Yossi Dagan, head of a regional council for Israeli settlements in the area, said there were "Jewish and Palestinian workers standing outside together and crying". The second woman was moderately wounded and taken to a nearby hospital for treatment.
Israeli media reported that those killed were found shot to death on their office floor with their hands bound.
Israeli Prime Minister Benjamin Netanyahu, for his part, vowed to bring the attacker to justice.
"Thousands of Israelis and Palestinians work side by side at Barkan, an industrial zone in the West Bank that includes some 160 factories".
The IDF later identified the assailant as Mr Naalwa, a Palestinian from the village of Shuwaika, north of Tulkarm, who worked at the factory as an electrician.
Israel's military said it was treating the killings as a terrorist attack.
Conricus called it a "terrorist attack" but added that other unspecified factors were involved. The worker, who carried a gun, fired back a shot at the gunman, but apparently missed. "That's what I think happened".
"Of course the main headlines in the Israeli media [are] yesterday's operation, the Barkan industrial zone factory operation, and responses". An Israeli woman also shot in the attack says a Palestinian treated her wounds.