LONDON — An attacker rammed a car into people outside a synagogue in Manchester, England, then went on a stabbing spree Thursday, killing two people in what police called an act of terrorism on Yom Kippur, the holiest day of the Jewish calendar.

Police said officers responded within minutes and shot and killed the attacker, whom they identified as Jihad al-Shamie, 35, a British citizen of Syrian descent. Though police described the assault as a terrorist attack, they also said that investigators were still “working to understand the motivation.”

Three other people were arrested, police said, on suspicion of commission, preparation and instigation of acts of terrorism in connection with the assault outside the synagogue, the Heaton Park Hebrew Congregation.

Police did not name those arre

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