of course, is how much freedom are americans willing to give up in exchange? national correspondent steve centanni examines that question tonight. authorities closed pennsylvania avenue in front of the white house. a false alarm over a stray package shuts down new york s laguardia airport. and washington, d.c. ramps up security for its emancipation day parade. we will have some enhanced security that probably some will, some will not be visible to the people who come down, but i want people to feel comfortable to take public transportation. and, of course, in boston, the men and women of blue are out in full force. that presence will be significantly enhanced. we are doing that for the comfort of the public. a lot of the talk about making the public feel comfortable. i felt a little uneasy in security. i think it would give us a little peace of mind in this horrible time. is it comforting? annoying? or troubling to see police wherever you look. things have changed in th
morning. absolutely. you can expect to see that there in that and other cities. want to be careful and saying we re not hearing about any credible threats in other cities from law enforcement. however, out of an abundance of caution they re obviously, as you mentioned, introducing this heightened state of alert. you mentioned new york city. obviously there s an increased alert on subways and hotels. you ll see more police on the ground in time square there. they re also deploying these critical response vehicles until they learn more about what s happened in boston. here in washington, the sidewalk outside of the white house has been taped off since last night out of an abundance of caution and today there s a parade called the emancipation day parade. we re told, brooke, that it will go on as planned, but they re hoping police and people will be especially vigilant. in los angeles, some of the airports there including lax,