New York City subway might be the target of a terrorist attack, and the city's police have taken additional measures to ensure the safety of the subway system and New Yorkers, said New York Mayor Michael Bloomberg Thursday.

The mayor told a press conference that the Federal Investigation Bureau (FBI) has shared information on specific threat to New York subway system, and this is the first time the city has information on specific threat.

The mayor assured the New Yorkers that the police have done and will continue to do everything they can to protect the city.

"We will spare no resources, and spare no expense. We will increase police presence at subway," he said, adding that the focus would be on mass transit vehicles and random bag search for people entering the system would be increased.

He urged the public to offer their help, reporting what they deem suspicious and letting the professional do the analysis.

Police Commissioner Ray Kelly and FBI official Mark Mershon were also present at the press conference.

Source: Xinhua