Law enforcement agencies across the United States are on high alert due to an elevated terror threat, prompting Jewish communities to increase security following a series of recent incidents, including an incident at Temple Israel synagogue in Michigan. Experts warn that the most pressing threat comes from individuals who act independently and are often difficult to detect before they strike. Jewish organizations are taking proactive steps to prepare for potential threats, with one group, Magen Am, training volunteers to respond in the event of an attack. Despite the heightened concerns, community leaders acknowledge there are limits to what can be done. The FBI has not yet determined a motive for the Michigan attack.