2014 Jerusalem synagogue attack
On the morning of 18 November 2014, two Palestinian men from Jerusalem entered Kehilat Bnei Torah synagogue, in the Har Nof neighborhood of Jerusalem, and attacked the praying congregants with axes, knives, and a gun. They killed four dual-nationality worshippers, and critically wounded a responding Druze Israeli police officer, who later died of his wounds.
Source: Wikipedia — 2014 Jerusalem synagogue attack (CC BY-SA 4.0)