MANCHESTER Police officers stand by a cordon as SOCO tents cover parts of the scene on the main road outside Heaton Park Hebrew Congregation synagogue in Crumpsall, north Manchester, on Oct. 3. Britain was on heightened alert Friday to ensure the Jewish community's safety following an attack outside a Manchester synagogue on a Jewish holiday that killed two people and seriously injured three. Police shot dead the attacker in Thursday's car ramming and stabbing spree in the northwest English