One of the terrorists behind Tuesday's massacre in Har Nof's "Kehilat Yaakov" synagogue worked next door, Palestinian sources told IDF Radio, at a grocery store in the Jewish neighborhood.
The two, reportedly identified as cousins Uday and Rassan Abu Jamal, are also Israeli Arabs who carry blue teudat zehut identity cards.
According to reports in the Palestinian media, the terrorists are relatives of Jamal Abu Jamal, a prisoner released as part of a "political gesture" to Palestinian Authority (PA) Chairman Mahmoud Abbas last year, in a four-part series of releases. Jamal Abu Jamal was rearrested a year ago and again earlier this month.
Meanwhile, the Israel police and the Israel Security Agency (ISA or Shin Bet) have raided the homes of two terrorists in the Arab neighborhood of Jabel Mukabar and arrested several members of their families for questioning.
The neighborhood has produced several terrorists responsible for large-scale attacks - including, among others, the terrorist behind the "tractor attack" near the Jerusalem light rail in August and the terrorist who carried out the 2008 Merkaz HaRav Yeshiva massacre.
Tuesday morning's massacre saw two Arab terrorists enter the Agassi St. synagogue with knives, guns, and axes before opening fire on worshippers.
Four were killed and at least six other were injured; all of them were wearing the traditional prayer shawls and tefilin (phylacteries) as they were being attacked.
Police arrived at the scene approximately five minutes after the attack began and shot the terrorists dead. In response, security officials have stated that reservists will be called up to secure the city and Prime Minister Binyamin Netanyahu has called an urgent Security Cabinet meeting for later Tuesday.