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Springs, colorado. hospitals say they have received at least nine patients at this point. police say that four officers have been injured and possibly a fifth. they say that the gunman has not yet been identified. they are not in voice contact with him. and also, he took items inside with him and they have concerns that some of them could be explosive devices. i want to bring in cnn national correspondent kyung lah, she's been following the story calling sources. give us the latest, kyung. >> we have to under score how dangerous the situation is. in the only are police dealing with an unpredic...

One week from tonight cnn will host the first democratic presidential debate in las vegas. i'll be moderating. the wildcard is joe biden, will he run or won't he? several sources close to biden say he's close to anonouncing hs decision. the vice president is grieving over the recent loss of his son, beau, and said he doesn't know if he's up for a president sh run. in august, maureen dowd wrote that beau biden's dying wish was for him to enter the race. denying a report by politico that mr. biden leaked the emotional detail to dowd to lay the groundwork for a race. joining me, gloria borger and...