lehigh county-based "runner's world" magazine says the bombings in boston will have a ripple effect on security at races across the country. wfmz's will lewis has that. >> reporter bart yasso just got home from boston.. and he is still in shock.>> bart yasso, chief running officer, runner's world magazine "i knew what it was because i've heard that noise and smell. smelled that smell before and knowing that noise. i knew it was a bomb.">> reporter yasso, is the chief running officer for runner's world magazine, based in emmaus, lehigh county. he's travelled all over the world covering running events and teaching. this is the third time he's been a witness to a bombing. the first time.. >> yasso "all these people with guns. they say don't move.">> reporr 2009 in iraq.. while a guest of the u.s. department of defense and setting up 5k races for soldiers.>> yasso "four in the morning we heard this motor shell hit a building close to where i was housed. it was a loud noise.">> reporter the second time two years later at the jerusalem marathon. "that i don't think was targeted for the race, i just think it happened just the day before the race and close to the race headquarters. it was kind of one of those things that is just more common place in a place like jerusalem.">> reporter yasso helps with the runner's world marathon in bethlehem and other marathons across the nation. he says what happened in boston will change security at all marathons.>> yasso "making areas more secure where large gatherings of people end up. so there tends to be a lot of people at the start line, finish line.">> reporter but admits it will be tough to protect the 26 point 2 miles. will lewis, 69 news. >>>wendy davis: stay with 69 news for