New York - The FBI has disseminated to 18,000 law enforcement agencies an intelligence bulletin advising police officials to be on the lookout for suicide bombers attempting to strike inside the US, TIME's Elaine Shannon reports today on TIME.com. The lightly classsified bulletin, headlined "Possible suicide bomber indicators," and circulated earlier today (May 20) via the FBO's secure Law Enforcement Online (LEO) Intranet, warns local badge-carriers to look for obvious signs of trouble - people wearing heavy, bulky jackets on warm days, smelling of chemicals, trailing wires from their jackets - and, as well, more subtle ones, such as tightly clenched fists. Someone who never shows his palms could be gripping a detonator rigged to go off when a button is released. "If you shoot him, you're still not safe because his hands relax and the bomb explodes," says a counter-terrorism official, TIME reports.

The FBI bulletin also notes that suicide bombers may disguise themselves in stolen military, police or firefighter's garb or as pregnant women, TIME reports.

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