Firefighters rushed to the scene of the attack as smoke billowed into the sky.

NPR: Car Bomb Targets French Embassy In Libya

While the Colorado researcher didn't know if the study participants were smokers or non-smokers, the CDC's editorial points out that the new study adds to research from eight other studies, which also saw a drop in heart attack related hospitalizations after smoke-free laws are enforced.

CNN: Study: Smoke-free laws may cut heart attack hospitalizations

It happened not far from Blackwater's safe houses, and some of the employees had gone to the roof to get a better look at the huge plume of smoke rising from the site of the attack.

CNN: Excerpt: Inside Blackwater's mission in Afghanistan