Prime Minister Sir Keir Starmer has pledged to deploy every resource to safeguard Britain's Jewish communities following a "horrific" Yom Kippur attack at Heaton Park Synagogue that claimed two lives and injured four, as police named the gunman—a 35-year-old British-Syrian man—and arrested three suspects in a widening terror probe.

The assault unfolded Thursday morning amid packed services for Judaism's holiest day, with Jihad Al-Shamie ramming his car into the crowd before stabbing victims and being shot dead by armed officers eight minutes later.

Greater Manchester Police Chief William Renye described the scene as "horrendous," with eyewitnesses recounting chaos as worshippers sheltered children in back rooms—a "heroic" act that likely averted worse.

The dead were identified as 53-year-old Adrian Daulby and 66-year-old Melvin Cravitz; four others remain hospitalized.

Starmer, cutting short a European summit in Denmark, chaired an emergency Cobra meeting and addressed Jews directly: "I know how much fear you will be holding... Nobody should have to do that." He promised visible police boosts and invoked Britain's history as a Jewish refuge, vowing to crush "rising hatred."

King Charles III echoed the grief, calling it "deeply shocking," while Israeli PM Benjamin Netanyahu labeled it "barbaric terror" and blamed Western "weakness."

The incident, the deadliest on UK Jews since 2019's Halle shooting, has ignited soul-searching.

Chief Rabbi Sir Ephraim Mirvis warned it was "the day we hoped never to see," linking it to unchecked Jew-hatred on streets and campuses. Imam Qari Asim and the Church of England's Bishop of Manchester decried division, urging unity. Greater Manchester Mayor Andy Burnham condemned the "vile" act and rallied support for the community.

As forensics sift Al-Shamie's motives and phone records, the attack underscores a 400 percent antisemitism spike since October 2023, per Community Security Trust data.