LONDON — Counterterror police in Britain were investigating an arson attack at a former London synagogue Tuesday as Prime Minister Keir Starmer hosted a meeting to respond to a wave of antisemitic attacks that have caused outrage and fear in the Jewish community.Gates and a lock on the front of the former temple in the Whitechapel area of east London had minor damage, but no one was injured, Metropolitan Police said.The incident is the latest since four ambulances owned by a Jewish charity were torched in March. Since then, a synagogue was firebombed and other Jewish sites have been targeted...