Masked Palestinians hold axes and a gun as they celebrate with others an attack on a Jerusalem synagogue, in Rafah in the southern Gaza Strip, on November 18, 2014. Two Palestinians armed with a meat cleaver and a gun killed four people in a the Bnei Torah synagogue in Jerusalem's Har Nof neighborhood on Tuesday before being shot dead by police. This was the deadliest attack in six years in the Jerusalem, and comes after a series of car-ramming and stabbing terror attacks in Israel. Photo by Abed Rahim Khatib/Flash90

A Palestinian woman scatters sweets as she celebrates with others an attack on a Jerusalem synagogue, in Rafah in the southern Gaza Strip, on November 18, 2014. Two Palestinians armed with a meat cleaver and a gun killed four people in a the Bnei Torah synagogue in Jerusalem's Har Nof neighborhood on Tuesday before being shot dead by police. This was the deadliest attack in six years in the Jerusalem, and comes after a series of car-ramming and stabbing terror attacks in Israel. Photo by Abed Rahim Khatib/Flash90

A masked Palestinian distributes sweets as he celebrates with others an attack on a Jerusalem synagogue, in Rafah in the southern Gaza Strip, on November 18, 2014. Two Palestinians armed with a meat cleaver and a gun killed four people in a the Bnei Torah synagogue in Jerusalem's Har Nof neighborhood on Tuesday before being shot dead by police. This was the deadliest attack in six years in the Jerusalem, and comes after a series of car-ramming and stabbing terror attacks in Israel. Photo by Abed Rahim Khatib/Flash90

Palestinians celebrate killing of the Israelis in a Jerusalem synagogue, in Rafah in the southern Gaza Strip, on November 18, 2014. Two Palestinians armed with a meat cleaver and a gun killed four people in a the Bnei Torah synagogue in Jerusalem's Har Nof neighborhood on Tuesday before being shot dead by police. This was the deadliest attack in six years in the Jerusalem, and comes after a series of car-ramming and stabbing terror attacks in Israel. Photo by Abed Rahim Khatib/Flash90

Masked Palestinians hold axes and a gun as they celebrate with others an attack on a Jerusalem synagogue, in Rafah in the southern Gaza Strip, on November 18, 2014. Two Palestinians armed with a meat cleaver and a gun killed four people in a the Bnei Torah synagogue in Jerusalem's Har Nof neighborhood on Tuesday before being shot dead by police. This was the deadliest attack in six years in the Jerusalem, and comes after a series of car-ramming and stabbing terror attacks in Israel. Photo by Abed Rahim Khatib/Flash90

Masked Palestinians hold axes and a gun as they celebrate with others an attack on a Jerusalem synagogue, in Rafah in the southern Gaza Strip, on November 18, 2014. Two Palestinians armed with a meat cleaver and a gun killed four people in a the Bnei Torah synagogue in Jerusalem's Har Nof neighborhood on Tuesday before being shot dead by police. This was the deadliest attack in six years in the Jerusalem, and comes after a series of car-ramming and stabbing terror attacks in Israel. Photo by Abed Rahim Khatib/Flash90

Masked Palestinians hold axes and a gun as they celebrate with others an attack on a Jerusalem synagogue, in Rafah in the southern Gaza Strip, on November 18, 2014. Two Palestinians armed with a meat cleaver and a gun killed four people in a the Bnei Torah synagogue in Jerusalem's Har Nof neighborhood on Tuesday before being shot dead by police. This was the deadliest attack in six years in the Jerusalem, and comes after a series of car-ramming and stabbing terror attacks in Israel. Photo by Abed Rahim Khatib/Flash90