Police in major cities step up security after Boston attack
Updated: Tuesday, April 16 2013, 10:50 PM EDT
GRAND RAPIDS, Mich. (NEWSCHANNEL 3) - Police in Los Angeles, New York City, London, and other cities worldwide are stepping up security, after bombs explode at the Boston Marathon.
After the explosions, the Boston Police Commissioner was urging people to stay indoors and not congregate in large groups.
Newschannel 3's Jared Werksma joined us with this report from Grand Rapids, where he spoke with a professor at Grand Valley State University who is an expert in terrorism.