An Israeli security guard on Friday shot dead a Jewish man at Jerusalem's Western Wall, the holiest site where Jews can pray, apparently mistaking him for a Palestinian militant.
Public radio said that police were seeking to have the guard remanded in custody.
Police spokesman Micky Rosenfeld said that he was being taken in front of a magistrate, but had no further details.
"There was a Jewish guy, an Israeli guy, who was in the bathroom area," Rosenfeld told AFP.
"He for some reason shouted 'Allahu Akbar'," Rosenfeld said. "A security guard drew his weapon and fired several shots at the suspect... He died from his wounds" later.
An acquaintance told army radio the man was a volunteer at a nearby soup kitchen run by the Hassidic Chabad movement.
"He's a regular here, well-known," David Dahan said.
"He's on his own here, his parents are in France."
Rosenfeld could not immediately confirm reports that the man held both French and Israeli citizenship.
State television identified him as Doron Ben Shloush, a 46-year-old homeless man who was known to have "sudden rage attacks" and who visited the Wailing Wall frequently.
The shooting took place shortly before 8 am (0500 GMT) as the plaza in front of the Wall filled with worshippers for morning prayers ahead of the start of the Jewish Sabbath at sundown.
The site was closed to the public for more than two hours afterwards.
Paramedic Zeevi Hessed told news website NRG that his team rushed to the scene as reports of a shooting came in.
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"When we reached the place, we saw him lying at the Western Wall plaza," he said. "He had been shot in several parts of his body... Sadly there was nothing we could do but declare him dead."
Rosenfeld said that an investigation had begun into the shooting.
Public radio quoted the private security guard as telling police investigators that he thought the man was pulling something from his pocket as he shouted, and was about to attack him.
It said that police found nothing suspicious on the man's person.
Privately owned Channel 10 TV said the dead man was believed to be mentally disturbed.
It cited witnesses as saying that the guard fired between seven and 10 shots, that the fire was unjustified and that the man appeared to be a harmless eccentric.
Rosenfeld said the circumstances were still unclear.
"We're looking into the background: why the security officer opened fire and what the motives were of the guy, the 46-year-old -- it's very strange behaviour."
The Western Wall's rabbi, Shmuel Rabinovitch, told the Ynet news site: "Regardless of the circumstances, such a case is a terrible tragedy."
Ynet quoted witnesses it did not identify as saying that the guard did not fire warning shots or attempt to disable the man but shot directly at his chest.
The site is venerated by Jews as the last remnant of the wall supporting the Second Temple, which was destroyed by the Romans in 70 AD.
Above it is the compound housing the Dome of the Rock and the Al-Aqsa mosque, the third holiest site in Islam.
Known to Jews as the Temple Mount, the compound is a deeply sensitive location where clashes frequently break out between Palestinian worshippers and Israeli forces.
Jews are not allowed to pray inside the Al-Aqsa mosque compound.