NEW YORK - Commuters are reacting to word that al-Qaida had planned to attack trains on the anniversary of the Sept. 11 attacks.

Officials have warned local law enforcement asking them to be vigilant after evidence of the plot was found in Osama bin Laden's compound after his death.

Last month, federal money was used to beef up the state police department's K-9 Security Unit which now uses five bomb-sniffing dogs on Metro-North's New Haven line.

The MTA responded to the warning by issuing a statement, "This is another reminder that our transit system remains a top target and we must always remain vigilant."