The heartbreaking reason why 1,100 victims of 9/11 have yet to be identified decades after terror attack

'Rapid developments' in manhunt for Charlie Kirk assassin after photos of'person of interest' were released: Live updates Charlie Kirk's body to be flown home aboard Air Force Two in rare tribute Dave Portnoy slams'insane' left in furious Charlie Kirk rant... but adds Donald Trump'played a part' in death Who are Charlie Kirk's parents and who was his mentor Bill Montgomery? Savannah Chrisley says she was set to join Charlie Kirk on his tour as she shares'heartbreak' over his death And the armed militia mystery. FBI terror hunter blows the lid on search for Charlie Kirk's assassin... and the vital clue cops are desperate for Shattered boyfriend of slain Ukrainian woman speaks out and reveals reason he WANTS everyone to watch the video: 'This is important to know' Elite sniper breaks down Charlie Kirk assassin's sick plot... and reveals tiny detail everyone's missed: The gun. Jimmy Kimmel reacts to assassination of Charlie Kirk: 'No finger pointing' Elon Musk unleashes explosive rant on Kirk assassination calling the left'the party of murder' 'Radicalized' Colorado school shooter who used revolver to open fire'again and again' at screaming kids is pictured Jennifer Lopez STILL living in $68M mansion she shared with Ben Affleck one year after listing, here's why Charlie Kirk's'incredibly strong' wife is too heartbroken to tell her children that'daddy isn't coming home' NBA's first openly-gay player Jason Collins reveals brain tumor as ex-Nets center starts cancer treatment MORE: Mystery of'fifth' 9/11 plane: United Airlines pilot claims his flight was intended to be hijacked The lab in charge of identifying the victims of the 9/11 terror attack has revealed why nearly half of their work remains unfinished more than two decades later. The New York City Office of the Chief Medical Examiner (OCME) said that approximately 1,100 people who were in the World Trade Center still haven't had their remains confirmed because of insufficient DNA evidence.