The deadly bomb attack on the Boston Marathon highlights what may be a growing threat to American cities — the use of IEDs to target large gatherings, inflicting mass damage with a device that is difficult to detect.

Security experts say the use of IEDs is becoming a preferred tool of terror in both domestic and global attacks — or attempted attacks — against the United States.

“The reason to use an IED or multiple IEDs is that you’re trying to create an oversized impact, and as much panic and disruption as possible,” Bill Braniff, the executive director of the National Consortium for the Study of Terrorism and Responses to Terrorism, told FoxNews.com Tuesday.

The FBI and Department of Homeland Security on Tuesday sent an intelligence bulletin to law enforcement across the country noting that the Boston attack follows a pattern.

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