The FBI and Department of Homeland Security issued a warning on Wednesday morning about large Fourth of July celebrations.
The security organizations say the biggest threats are lone offenders and small groups, who may have a larger agenda, and find large events such as holiday gatherings "attractive" targets, according to a bulletin.
"The political environment of the country certainly doesn't help," Aaron Katersky, a security correspondent, told ABC News. "The police are being told by the FBI and Department of Homeland Security to be on watch for these types of things that are notoriously difficult to guard against."
Katersky added that big cities including New York and San Francisco are likely potential targets.
He added that citizens should proceed with caution, however they should not panic.
Here are the top political news stories for today.
Join in on more popular conversations.
