is cnn newsroom, with rosemary church. thinks of being with us. we are following the developments. this hour, out of the group ukraine, we are learning that a reactor has been shut down. a protection system has been activated because of shelling. this comes as u.n. inspectors are en route to the site, as fears grow that the shelling could trigger a nuclear accident. earlier, we saw the team from the international atomic energy agency head out from the city. before they left, the head of the agency spoke about the significant risks involved in their mission. we are moving. we are aware of the current situation. there has been increased military activity, including this morning. until very recently, a few minutes ago, i have been briefed by the ukrainian regional military commander, here. about the inherent risks. weighing the pros and cons,. having come so far, we are not stopping. we are moving, now. melissa bell is following development. she joins a life in kyiv. this
plant that had been down to two reactors functioning, is now down to a single one. as far as we know, the inspectors continue to make their way towards the plant. whether they will get there, giving the shelling, it is about a two-hour drive between the town and the plant. they are still, as far as we know, on their way. but, it is perhaps more dangerous than we imagined it would be, given the shelling. there will be a question of access. whether or not they can get to these russian controlled territories on the south side. and, whether they are going to be able to get inside the plant. what we heard was that the first mission was to ensure the security and safety of the plant. then, to see whether a permanent mission could be established. at this stage, given the showing this morning and the situation around the plant which is tense it is unclear whether that is going to be able to go ahead.