The FBI says a radical domestic group may attack media vehicles in an attempt to disrupt next week's Democratic National Convention (search).

"The FBI has received unconfirmed information that a domestic group is planning to disrupt the (convention) by attacking media vehicles with explosives or incendiary devices," the FBI said in a statement.

The FBI didn't release any other details, including the name of the group, or when it might attack. Television stations were warned Thursday. The four-day convention begins Monday at the FleetCenter (search), where several satellite trucks are already stationed.

The FBI's Boston Joint Terrorism Task Force (search) is investigating.

Several local TV stations planned a conference call Friday to determine if extra security is needed. Already, local stations have trucks at two main sites and are sharing the cost of police details.