Nightly News   |  April 20, 2013

Security tight at events across US

All around the country, recreational events are on a parallel track with a nation on guard. NBC’s Michelle Franzen reports.

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>>> the relief of this frightening chapter may be over has not erased the sense of vulnerability and the response was evident today at public events throughout the country. michelle franzen has that story for us tonight.

>> asbury park , runners started the day with bomb sniffing dogs and police patrols. unprecedented measures for a foot race in this historic jersey shore town.

>> we made sure public safety was a paramount situation here.

>> all around the country, recreational events are on a parallel track with a nation on gourd. in california at the annual long beach grand fredericksburg. more manpower and vigilance to handle the 170,000 spectators attending a celebrity charity race.

>> i do think the police presence is necessary.

>> security experts say there are no credible threats, but the boston bombing stripped away another layer of innocence to every day american life .

>> it doesn't mean you cancel events, but you want to be monitoring crowds. you want to have perhaps more dogs, more undercover agents .

>> at miami international , a security director ordered everyone to pay even closer attention to their surroundings.

>> to be on the lookout for any suspicious behavior or unattended bags.

>> overseas, london will deploy more than 700 police officers for tomorrow's marathon, the first big race since boston.

>> i've increased by policing operation with high visibility patrols.

>> back in new york, a city rused to being on high alert, nypd officers will be out in full force at two races tomorrow, including the annual 9/11 memorial 5k.

>> whatever they have to do that's necessary.

>> a new sense of security and a new normal taking shape. michelle franzen , nbc news, new york.