now, authorities are on alert this weekend as thousands of bikers around the country are gathering for annual memorial day celebrations. we've got a map here of the six biggest rallies being held across the country. tens of thousands of bikers are expected to come together in places like red river, new mexico, buckhorn, missouri. and a lot of other cities, including washington, d.c., adding extra security. that's because of the deadly biker brawl in waco, texas, last sunday. nine people killed. 170 people arrested. >> in fact, justice correspondent evan perez is following the latest on the new word on the brawl. good morning. >> good morning, the memorial day weekend is a popular time for motorcycle rallies around the country. but this weekend, there are concerns about biker gang. the department of public safety warns that members of the ba