In the lead-up to one of the busiest travel weeks of the year, a new intelligence bulletin obtained by Fox News warns that terrorists have targeted bus networks more than any other mode of surface transportation.

The two page assessment, sent to law enforcement in the nation’s capital, says in part, “bus systems are considered attractive terrorist targets because they are relatively soft targets.”

Earlier this week, Transportation Security Administration Director John Pistole underscored the threat to reporters in Washington.

“It’s something that we’ve seen in reporting over time that terrorists around the world clearly are interested — because of the accessibility, the open architecture — both of buses and rail.”

The bulletin, called “Terrorist Concerns Regarding Mass Transit Bus Systems,” was sent to law enforcement in the nation’s capital on Nov 3. It says bus attacks, similar to an attack by a suicide bomber using an explosive-laden backpack in 2005, are more widespread than attacks on the airline industry. The assessment says over 725 such attacks have been documented from 2004 through 2009.

Continue reading on