Elsewhere, three Palestinians died Friday when clashes between Israeli security forces and Palestinians turned violent, the Palestinian health ministry said.
As Israeli and Palestinian leaders faced pressure to respond, Palestinian president Mahmud Abbas announced late Friday he was freezing contacts with Israel over the holy site dispute.
Israeli security forces have killed over 255 Palestinians, many they say were would-be attackers.
Mr Gallant, who is also a former commander of Israeli forces in Gaza, said he opposed the metal detectors because the Palestinians were using them as an excuse to incite to violence against Israel. It is the holiest Jewish site and the third holiest in Islam.
Israeli Prime Minister Benjamin Netanyahu said the metal detectors will stay up for now but added he will have "additional security consultations" in the future about the issue.
It said the Palestinian killed a man and two of his children, while a woman was wounded and taken to hospital.
"Such intrusive and dehumanizing practices", she said in a statement, "aim to provide Israel with carte blanche to exercise security control over the holy sites of Jerusalem". They refused to enter, preferring to pray outside, in some cases filling the narrow alleyways of the Old City's Muslim quarter.
The israeli police stated that it could decide that some persons, at his discretion, did not have to go through the metal detectors.
The site is know to Muslims as the Noble Sanctuary and to Jews as the Temple Mount.
The tensions have gone a crescendo last week after a gun attack at a fire that claimed the lives of two israeli police on the 14th of July in the old city of Jerusalem. Roadblocks were in place on approach roads to Jerusalem to stop buses carrying Muslims to the site.
It lies in east Jerusalem, seized by Israel in the 1967 Six-Day War and later annexed in a move never recognised by the global community. Aware of the potentially explosive religious and political sensitivities, Israel allowed the Waqf to remain in charge of day-to-day affairs inside the mosque compound under the aegis of Jordan.