family flying. these loopholes still exist. absolutely. thank you. it s the top of the hour and i want to update you on a story that s developing. a bus carrying israeli tourists exploded. the death toll has grown to six. there s a great deal of speculation as to who is to blame for this. elise is covering this story for us. israel is blaming iran for this. why is that? reporter: in recent months they say the israelis have th thwarted atakes. they say they have indications it could be iran. they are saying the explosion was the result of a bomb in a tourist bus. the bus exploded from a bomb within. eyewitnesss are describing accounts of seeing victims on the ground. the defense minister left no doubt about who the israelis think it was. let s take a listen. this is clearly a terrorist attack initiated by probably jihad or any other group under either iran or other groups. we re in a continued fight against them. we re determined to identify who sent them and executed
outfront tonight, is syria at a tipping point? the pressure is building on syrian president bashar al assad who is no doubt watching his back this evening after an attack struck the heart of his regime. a regime that s been in power for over 40 years and has launched a brutal crackdown on rebels over the last 16 months, killing more than 16,000 people, according to one opposition group. whether today s bloodshed is the result of a rebel attack or an inside job, one thing is clear assad s security perimeter has been breached. state tv reports those assassinated at a high-level meeting in damascus include the defense minister, the deputy defense minister who s also al assad s brother-in-law, and his security adviser. rebels danced in the street following the explosion. the opposition forces have come a long way since the uprising began. that has deputy defense secretary leon panetta worried the situation is quickly deteriorating. the violence there has only gotten worse a