>> ed foulke headed osha, the u.s.d to safeguard workplaces, from april 2006 to november 2008. in march 2008, he told congress that osha was on the case. >> we are doing the job. and we are getting to the places we need to get to. >> when we talked with foulke in 2008, he told us that some 50 of his 1,029 inspectors had extensive dust training. he says osha sends inspectors to companies with the greatest risk of a dust explosion. and it turns out there are a lot of those. you've identified 30,000 workplaces that are at risk. how many of those will you inspect over the next year? >> well, approximately 300 or more. >> if you do 300 a year, it'll take you 100 years to inspect all those places that you've identified. >> we're not gonna get into every work site every year. we're not gonna get-- it would be physically impossible from a monetary standpoint and on a personnel standpoint to get in every facility once a year or even every five years. >> [blows whistle] >> foulke blames employers for the dust explosions. too man

let's go to bbc's imojen foulkes in geneva.he use of siege warfare and starvation in syria, what is the u.n. describing? >> reporter: it's describing a situation affectth over a quarter of a million people, many of them women and children who are trapped inside cities across the country, bombed relentlessly on a daily basis, the u.n. says, that no food or medical care is being allowed in. there's very little food. people are eating leaves, tree twigs to survive, and people -- this is one of the things that has really, really shocking is people who try and sneak out, women, to get a bit of food to feed their children are being attacked and the food taken away from them when they try to go back in. so this is really a fundamental law of war, if you like, being violated, and yet another in a very long catalog of crimes against humanities in which the u.n. has documented. >> this is being tabled to the human rights council with only limited access to people because of the dangers of being there. what on earth can be done to even be