Israeli security forces raided the village of a Palestinian suspected of shooting two people dead, the army said on Monday, making arrests while the assailant remained at large.
Ashraf Naalwa, 23, from the northern West Bank village of Shuweika, has been named by the Israeli army as the Palestinian behind Sunday's attack in the occupied West Bank industrial area of Barkan, where two Israelis were killed and a third wounded.
Soldiers, as well as police and Shin Bet internal security officers "operated in the village of Shuweika, north of Tulkarm, from which the terrorist originated," the military said.
It said security forces "arrested" an unspecified number of people "suspected of aiding the terrorist" while a manhunt for the gunman was still underway.
A spokesman for the Shin Bet said they had arrested Naalwa's brother, while his sister was "detained, questioned and released", declining to provide further details.
Mr Naalwa was employed at the same plant in the northern West Bank site as his two victims – Kim Levengrond Yehezkel, 28, and Ziv Hagbi, 34.
Mahmoud Abbas backing for refugee agency falls on deaf ears
In this hospital, Palestinians' healthcare may feel brunt of Donald Trump's cuts
Trump targets Palestinian right of return with UN funding cut
Palestinians work side by side with Israelis in the industrial zone.
A third woman also shot in the attack was was taken to hospital and is in a stable condition.
Levengrond Yehezkel, who was buried late Sunday, had been bound to a chair by Naalwa with cable ties before being shot, according to her father.
The army said that Mr Naalwa used a homemade gun, known locally as a "Carlo", in what was believed to be a "lone-wolf attack," meaning he was not part of a militant organisation or acting on its behalf.
The army called the shooting a "terrorist attack", adding that other unspecified factors were involved.
A wave of Palestinian attacks against Israelis broke out in 2015, but they have since become sporadic.