Terror Threats Boost Security Measures

The New York police department has boosted security measures in the city's subway system. They are searching bags, briefcases, and luggage. It is a day after city officials announced they had word of a possible plot to set off bombs underground.

It looked like business as usual in New York city's subways this morning. But it was impossible to ignore the extra security in many of the system's four-hundred-ninety stations.

One day after Mayor Michael Bloomberg warned of a plot to set off bombs in the subways, subway riders had mixed opinions about the true level of danger. Marco Berrios, subway rider, was asked about if he felt safe on the subway system. " Well not very safe because anyone can just go in and out."

Another subway ride,  Julio Garcia said, "I have nothing to fear, really. I feel safer than ever." New York city officials alerted the public to the plot after the arrests of three Iraqi insurgents in northeast Iraq. Sources say one of the Iraqis told of a plan to travel to New York to carry out subway bombings.

An FBI informant gave authorities additional details about the explosives, which were to be concealed in a baby carriage. The informant also revealed the identity of one bomber already in this country. In spite of the heightened security, the department of homeland security says the threat is of "doubtful credibility."

Richard Clarke, counterterrorism expert and ABC news consultant said, "It's a credible threat, but it's not corroborated. What does that mean? It means these people were really terrorists. But we have only the one source."