but it appears his name is yasin saadi. he was in our files in 2006. this was not maintained in our files in 2008. shirley: police are investigating the flags the suspect left behind. authorities say security will be strengthened outside of sensitive sites. tom: we can listen now to what the french public prosecutor had to say about the attack. >> in an area that is not covered by security cameras, the victims head was found attached to the gate of the factory and flamed by two flags which featured an islamic declaration. tom: the public prosecutor speaking. we are on the scene of where this morning's attack occurred. ben, clearly, a huge amount of shock there. what sort of things are you hearing local residents telling you about this event quite out of the blue happening in their backyard? ben: indeed, well, this is mainly an industrial area with factories, an air products factory where the attack was carried out as well as other large companies. and fedex as well. now there are a few residents nearby. i spoke to someone who was offering food to peopl