refuse to be intimidated by it. for 10 years we have not allowed terrorists to intimidate us. we have lived our lives without fear. and we will continue to do so. go about your business as you normally would. just be vigilant. if you see something potentially suspicious, call 311. if you see something that you think is potentially dangerous, call 911. earlier this evening i had a conversation with homeland security secretary janet napolitano about the threat and what is being didn't in response. i also had a conversation with the executive director of the mta. they are heightening security at mta bridges, tunnels and other transit infrastructure. for the record, i plan to take the subway tomorrow morning and feel just as safe as i did when i took it this morning. now, i would like to ask jane to tell us more about the nature of the threat.