to have an extra level of vigilance and pay attention to any suspicious device, whether it be a package, a bag, a backpack, anything that looks out of place and do not approach it. brian: there you go. we have seen this way too much. this latest blast coming just hours after police urged the bomber to surrender. ainsley: a reward for any information is now up to $115,000. steve: what's different about this, and as we just mentioned, it sounds like it was detonated perhaps by a trip wire, is unlike the previous bombings, the package bombs, they weren't left at somebody's house, apparently this was alongside the road and a couple guys were going through maybe on a bike, tripped the wire and then it exploded. ainsley: any wire that runs across the road or something like that is what a trip wire is? steve: essential a trigger.