Read the NYPD summary here. While there is no information indicating any connection to the Jewish community, the NYPD conclusions are relevant and Jewish organizations should factor these considerations into their security planning:

• Vehicles loaded with incendiary materials are easy to procure and could potentially cause significant damage.
• But as was the case in London and Times Square, timed ignition of incendiary devices is difficult at best.
• Ordinary automotive vehicles draw little attention, however, vehicles operated in out of the ordinary ways, such as left running unattended or parked in a hurried manner, call for attention.
• If You See Something, Say Something! Report suspicious activity to: 1-888-NYC-SAFE (1-888-692-7233)