JAMES MACKENZIE and NIDAL AL-MUGHRABI A gunman killed at least seven people and wounded 10 others in a synagogue on the outskirts of Jerusalem in an attack that heightened fears of a spiral in violence, a day after the deadliest Israeli raid in the West Bank in years. Police said the gunman arrived at around 8.15 p.m. and opened fire, hitting a number of people before he was killed by police. TV footage showed several victims lying in the road outside the synagogue being tended to by emergency workers. The attack, which police described as a "terrorist incident", underlined fears…