Police in New Jersey say a Jewish supermarket was the target of a gun attack which left six people dead on Tuesday, including the two suspects. No motive has yet been given, but the mayor of Jersey City tweeted on Wednesday morning that "hate and anti-Semitism" had no place in the city. The gun battle began when the suspects killed a detective across town, then drove a rental van to the market. Security video shows them firing on the market before going inside. Investigators believe that the three people found dead inside the kosher market were killed by the attackers, who were also found dead inside the building following a four-hour standoff with police. On Wednesday morning the mayor of Jersey City, Steven Fulop, told reporters that street cameras showed the suspects "slowly" drive towards the market, then "calmly open the door with two long rifles and begin firing from the street" into the shop. Public Safety Director James Shea added that video shows they parked their van "and immediately began firing on the location". Asked how police are certain the shop was targeted, he said that they "bypassed" many other people walking on the street to attack the store. The attackers have not yet been publicly identified. The New York Times reported on Wednesday that one of the suspects had made anti-Semitic and anti-police social media posts online, but that has not yet been confirmed.