Investigators are looking to pinpoint what prompted a deadly attack on a Jewish market in Jersey City amid fears that it was motivated by anti-Semitism. A gunbattle and standoff at the JC Kosher supermarket this week turned the neighborhood into a virtual war zone and left six people dead — the two attackers, a police officer and three people who had been inside the store. In addition, authorities have found social media postings from at least one of the attackers that were anti-police and anti-Jewish, the official said.