July 18, 2016 12:10 pm Security on Notice as RNC Begins in Cleveland Security from across the country is in Cleveland to help out for the 2016 Republican National Convention. NBC 6’s Willard Shepard has the story from Ohio. US & World Videos 1:36 6 to know – Top stories of the day 1:32 6 to Know – Top stories of the day 1:23 6 to know – Top stories of the day 1:42 6 to know – Top stories of the day 1:48 6 to know – Top stories of the day