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Expected to have forensic evidence. we've been reporting on that for a while. that could be tissue samples, other physical evidence that chemical weapons were used. then the next stop, you just heard from the defense secretary hagel, they are ready to carry out any type of order that the president would issue. we are also told by officials that this is expected, if there is an operation, that it would be limited and it could actually be over in just several days. carol? >> jill doherty, reporting live from the white house. one of the syria as mo loyal allies is also the stronge critic of the u...

That site. the official says the sources took tissue samples and other evidence shortly after the attack and it was being analyzed in secure locations. that's why the white house tone changed so quickly from friday's get the inspectors in to sunday's it's too late to be credible. and it's why an administration official sounded so confident in saying there is little doubt at this point that a chemical weapon was used by the syrian regime against civilians. the president's newly updated options include cruise missiles launched or jets firing weapons from outside syrian air space. >> we are prepa...

Shelled the site of wednesday's attack so much, it corrupted any evidence the u.n. might find this week. a u.s. official tells cnn behind the scenes, multiple international sources have already collected evidence from that site. the official says the sources took tissue samples and other evidence shortly after the attack. and it was being analyzed in secure locations. that's why the white house tone changed so quickly from friday's get the inspectors in to sunday's it's too late to be credible. and it's why an administration official sounded so confident in saying there is little doubt at this...

Last week. there were flow injuries in this morning's sniper -- no injuries in this morning's sniper shooting, but no word on who is responsible for it. activists say the u.n. inspectors later reached the site and did check the area with doctors. our chris lawrence is covering this developing story. >> reporter: the bombs are falling -- [ explosions ] >> reporter: the accusations flying. now the pressure's on president obama to defend his red line on chemical weapons which rebels claim killed more than 1,000 people in syria. >> we cannot sit still. we've got to move and got to move quickly. >>...

Chemical weapons which rebels claim killed more than a thousands people in syria. >> we cannot sit still. >> reporter: syrian forces shelled so much it corrupted any evidence the u.n. might find this week. a u.s. official tells cnn behind the scenes multiple international sources have collected evidence from that site. the official says the sources took tissue samples and other evidence shortly after the attack. it was being analyzed in secure locations. that's why the white house tone changed so quickly from friday's get the inspectors in to sunday's it's too late to be credible. it's why an ...