It’s been a while since we’ve heard about these threats. Is this one worthy?

By JAMES GORDON MEEK in Washington and ALISON GENDAR and LARRY McSHANE in New York
DAILY NEWS STAFF WRITERS
The city subway system received an infusion of additional police protection Wednesday after reports that Al Qaeda terrorists had considered targeting local mass transit with suicide bombers.
The FBI and the Department of Homeland Security issued a joint warning to state and local officials on Tuesday night about the terrorist threat, said DHS spokeswoman Laura Keehner.
The warning followed “plausible but uncorroborated information that Al Qaeda may have discussed targeting the transit system in or around New York City,” Keehner said.
NYPD Deputy Commissioner Paul Browne said police were aware of the terrorist threat, and responded by sending additional cops throughout the subway system.
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