Celebrations broke out in the Gaza Strip Tuesday after the news that two Palestinian attackers stormed a Jerusalem synagogue during morning worship services, murdering four religious Jews, including three who held both U.S. and Israeli citizenship.

A Palestinian Hamas police officer receives sweets from a supporter of the Popular Front for the Liberation of Palestine, a small militant group, after they heard the news of a shooting attack in a synagogue in Jerusalem, on a main road in Gaza City, northern Gaza Strip, Tuesday, Nov. 18, 2014. Two Palestinian cousins stormed a Jerusalem synagogue on Tuesday, attacking worshippers with meat cleavers and a gun during morning prayers and killing four people in the city’s bloodiest attack in years. The attackers were killed in a shootout with police. (AP Photo/Adel Hana)

AP Photo/Adel Hana

Palestinian supporters of the Popular Front for the Liberation of Palestine dance while waving flags after hearing the news of a shooting attack inside a synagogue in Jerusalem, on a main road in Gaza City, northern Gaza Strip, Tuesday, Nov. 18, 2014. (AP Photo/Adel Hana)

AP Photo/Adel Hana

AP Photo/Adel Hana

The celebrations also extended online in cartoons shared on social media:

Anti-Semitic cartoon showing Jews murdered in a synagogue, posted on Hamas official Mushir al-Masri's Facebook wall. pic.twitter.com/6ev2YK8CIr

— Avi Mayer (@AviMayer) November 18, 2014

Once again, #Hamas shows its true face as it continues to encourage violence & celebrate the massacre in #Jerusalem pic.twitter.com/5TZhgw26Bz

— IDF (@IDFSpokesperson) November 18, 2014