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Israeli Prime Minister Benjamin Netanyahu has vowed to "respond with a heavy hand" after at least four people were killed and eight injured in what Israeli police described as a "terrorist" attack on a synagogue in Jerusalem.
Mr Netanyahu condemned violence as a "cruel murder of Jews who came to pray and were killed by despicable murderers”.
President Abbas denounced the bloodshed in a statement, saying: "The presidency condemns the attack on Jewish worshippers in their place of prayer and condemns the killing of civilians no matter who is doing it."
Unrest in Jerusalem Show all 22 Unrest in Jerusalem Jerusalem A masked Palestinian celebrates the attack on the Jerusalem synagogue holding a poster of the attackers,Ghassan and Uday Abu Jamal, during a rally in Rafah in the southern Gaza Strip
Unrest in Jerusalem Jerusalem A masked Palestinian youth wearing a Hamas headband uses a sling-shot to throw back a tear gas canister towards Israeli forces during clashes outside the Israeli-run Ofer military prison following the deadly attack on a Jerusalem synagogue
Unrest in Jerusalem Jerusalem 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
Unrest in Jerusalem Jerusalem Israeli Zaka emergency services volunteers carry the body of one of the two Palestinian assailants who were shot dead while attacking worshippers at a synagogue to an ambulance in the ultra-Orthodox Har Nof neighbourhood in Jerusalem
Unrest in Jerusalem Jerusalem An Ultra-orthodox jewish man prays at the scene of an attack, by two Palestinians, on a synagogue in the ultra-Orthodox Har Nof neighbourhood in Jerusalem
Unrest in Jerusalem Jerusalem An Israeli woman cries on a veranda next to a synagogue where a suspected Palestinian attack took place in Jerusalem
Unrest in Jerusalem Jerusalem An Israeli police officer gestures as he holds a weapon near the scene of an attack at a Jerusalem synagogue
Unrest in Jerusalem Jerusalem Israeli Zaka emergency services volunteers carry the body of an assailant who was shot dead while attacking a synagogue
AFP
Unrest in Jerusalem Jerusalem Israeli emergency services personnel clean the sidewalk at the scene of an attack, by two Palestinians, on Israeli worshippers at a synagogue in the ultra-Orthodox Har Nof neighbourhood in Jerusalem
Unrest in Jerusalem Jerusalem Israeli security personnel run next to the synagogue in Har Nof, where a suspected Palestinian attack took place
Reuters
Unrest in Jerusalem Jerusalem A Palestinian activist knocks a hole through the wall near East Jerusalem
AFP
Unrest in Jerusalem Jerusalem A masked Palestinian youth burns a tire near Israel's controversial barrier that separates the West Bank town of Abu Dis from Jerusalem
Unrest in Jerusalem Jerusalem A Palestinian protester throws a stone at Israeli troops during clashes in the West Bank town of Abu Dis near Jerusalem
Unrest in Jerusalem Jerusalem Palestinian mourners attend the funeral of bus driver Yusuf Hasan al-Ramuni in the West Bank town of Abu Dis from Jerusalem . A Palestinian bus driver was found hanged in his vehicle in Jerusalem, sparking clashes, after what Israel said was an apparent suicide but a colleague said looked like murder
Unrest in Jerusalem Jerusalem A Palestinian protester tries to hammer a hole through Israel's controversial barrier that separates the West Bank town of Abu Dis from Jerusalem
Unrest in Jerusalem Jerusalem Palestinian protesters climb a ladder at Israel's controversial barrier that separates the West Bank town of Abu Dis from Jerusalem
Unrest in Jerusalem Jerusalem Israeli border policeman arrested over shooting of Palestinian boy during West Bank protests
REUTERS
Unrest in Jerusalem Jerusalem Masked Palestinian youths clash with Israeli security forces in the east Jerusalem neighbourhood of Abu Tor
AFP
Unrest in Jerusalem Jerusalem Israeli fire fighters inspect the scene of an attack in Jerusalem. A Palestinian man rammed his car into a crowded train platform in east Jerusalem and then attacked people with an iron bar, killing one person and injuring 13 in what authorities called a terror attack before he was shot dead by the police. The militant Islamic group Hamas took responsibility for the attack
Unrest in Jerusalem Jerusalem Israeli police officers walk at the scene of an attack in Jerusalem
Reuters
Unrest in Jerusalem Jerusalem Israeli rescue workers and paramedics carry an injured man to an ambulance after a Palestinian man, Ibrahim al-Akri, was shot by Israeli police officers after he drove into a crowd of people
Unrest in Jerusalem Jerusalem Ultra-Orthodox Jews look on from behind a police line at the scene of a killing when a Palestinian man drove a van into a crowd of police and civilians along the tracks of the Light Rail trolley system in East Jerusalem
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