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The FBI has launched a review over
its handling of a warning about the teenager accused of carrying out
Wednesday's school shooting in Florida.
Mr Cruz reportedly commented on a YouTube post last year that he would be a "professional school shooter". The FBI admitted that a user had alerted authorities to the post.
Teachers were also warned about Mr Cruz, who was not allowed on campus with a backpack, US media report.
The FBI said it had investigated the YouTube comment but had been unable to fully identify the person who posted it.
The attack happened at Marjory Stoneman Douglas High School in Parkland, Florida. Fourteen people were wounded, three of whom remain in a critical condition.
On Thursday, Mr Cruz confessed to investigators that he carried out the shooting, adding that he had a backpack full of ammunition.
Expressing his condolences earlier, US President Donald Trump said he was "making plans to visit" Parkland.