Palestinian officials estimated up to 500 people were killed in an alleged Israeli airstrike on a hospital in the centre of Gaza City.But the Israel Defence Forces said it wasn't one of its bombs, blaming a Palestinian Islamic Jihad movement misfired rocket."The whole world knows: The barbarian terrorists in Gaza are the ones who attacked the hospital in Gaza, not the IDF," said Israeli Prime Minister Benjamin Netanyahu. "He who brutally murdered our children, also murders his children.".Earlier, Palestinian groups laid the blame on Israel doorstep.“A new war crime committed by the occupation in the bombing of Al-Ahli Arabi Hospital in the center of Gaza City, resulting in the arrival of dozens of martyrs and injured at Al-Shifa Medical Complex due to the bombing,” said the Palestinian Health Ministry in a Tuesday statement provided to CNN. “It should be noted that the hospital housed hundreds of patients, wounded and displaced people from their homes forcibly due to the airstrikes.” .The ministry noted many people remained beneath the rubble.Hezbollah announced Wednesday would be a day of anger against Israel.Hamas said the strike was disgraceful. “The Al-Ahli Hospital Massacre in the heart of Gaza Strip is a genocide,” said Hamas.“Enough silence on the aggression and recklessness of the occupation.” .Palestinian National Authority President Mahmoud Abbas declared three days of mourning after the explosion.He cancelled a planned meeting with US President Joe Biden on Wednesday.Hamas said this "exposes the American and Western support for this criminal occupation.""The international community and the Arab and Islamic countries must assume their responsibilities and intervene immediately, now and not tomorrow to stop the arrogance of the occupation and its fascist army and hold it accountable for the genocide it has been committing for the eleventh day in a row in the already blockaded area," it said..The IDF called for the evacuation of all people in Gaza City from their homes southward and asked them to move to the area south of Wadi Gaza on Friday. READ MORE: GET OUT: Israeli military demands people leave Gaza, Hamas tells them to 'stay put'“The Hamas terrorist organization waged a war against the State of Israel, and Gaza City is an area where military operations take place,” said the IDF. “This evacuation is for your own safety.”The incident has set off a wave of anger across the Arab world.There were reports of rioting in the West Bank.Media reports said protesters are trying to break into the Israeli embassy in Amman.