(WASHINGTON) -- The Department of Homeland Security and FBI are warning that large-scale events are prime targets for violence, highlighting the potential for violence at events this summer.
However, the DHS and FBI did not indicate there are any known threats in a joint intelligence bulletin sent to law enforcement on May 23.
"Violent extremist messaging continues to highlight major sporting and cultural events and venues as potential targets, and threat actors -- including domestic violent extremists (DVEs), homegrown violent extremists (HVEs) inspired by Foreign Terrorist Organizations (FTOs), and other mass casualty attackers not motivated by an ideology -- previously have targeted public events with little to no warning," according to the bulletin.
Some attacks, such as the New Year's Day truck attack in New Orleans, could serve as inspiration for future attacks, the bulletin said, noting that calls for violence typically increase in the days leading up to holidays or big events.
Domestic and homegrown extremists "not primarily motivated by an ideology, likely will see public events as potential attack targets, given the number of high-profile events this summer that are expected to draw large crowds and recent attacks and plots in the West targeting mass gatherings, which could serve as inspiration," the bulletin said.
"We advise government officials and private sector security partners to remain vigilant of potential threats to upcoming public celebrations and large gatherings," it added, highlighting World Pride 2025, Independence Day and the 250th Army anniversary parade as possible targets.
The bulletin also said some attackers could use a variety of means to carry out an attack.
"Attackers in the United States historically have used a variety of tactics to target public events, including vehicles, firearms, and improvised explosive devices (IEDs)," it said. "The use of vehicle-ramming alone or in conjunction with other tactics, such as edged weapons, firearms, or IEDs used after the vehicle has stopped, is a recurring tactic that a variety of threat actors in the West have employed when targeting crowded pedestrian areas."
Last week's shooting that targeted Israeli Embassy staffers and killed two in Washington, D.C., could inspire other attacks in the United States, the DHS said in a separate bulletin obtained by ABC News.
"The 21 May attack that killed two Israeli embassy staff members at an event in Washington, DC, underscores how the Israel-HAMAS conflict continues to inspire violence and could spur radicalization or mobilization to violence against targets perceived as supporting Israel," according to the bulletin, which was also dated May 23.
The department noted that it has seen online users sharing the suspect's alleged writings and "praising the shooter and generally calling for more violence."
"If calls for violence continue, particularly if other violent extremists in the Homeland or abroad reference the Capital Jewish Museum shooter, our concern for additional violence in the Homeland would increase," the bulletin said.
The suspect in the fatal shooting last Wednesday outside an event at the Capital Jewish Museum in Washington, D.C., is a 31-year-old Chicago man who police say shouted "free, free Palestine" following the attack.
The suspect, identified as Elias Rodriguez, was promptly taken into custody at the scene of the shooting and was questioned by police, according to Pamela Smith, chief of the Metropolitan Police Department of the District of Columbia.
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