The FBI said Friday it received a tip about the Florida school shooter in January but that it didn't investigate.
Police say the suspect, Nikolas Cruz, confessed to the shooting at Marjory Stoneman Douglas High School in Parkland, Florida. Seventeen people died.
The FBI now admits someone close to him called in a tip to the bureau's Public Access Line on Jan. 5. But that tip was never passed along to the FBI field office in Miami, so no one investigated.
In a statement, FBI Director Christopher Wray said the department deeply regrets the error. He also said he is committed to getting to the bottom of what went wrong.