mass transit including subways and airports getting a close look right now. the tighter security appears to go up and down the east coast, as far as south as miami and as far west as san francisco and seattle. of course it is just about as tight as it can get in the city of boston, itself. police there are on emergency deployment. john farahs, cnn washington. >> we have been reporting that there is a lot of police activity in revere, massachusetts. that is not far from boston. about five miles. >> brian todd is there. he joins us on the line now. what are you seeing? >> we were told by a massachusetts state police