The feds are looking into whether terror-related tips over the past three years were properly investigated.
The review follows several attacks, including the orlando nightclub shooting, as well as one in New York and Florida.
In each case, the suspects were once on the FBI’s radar, but it was later determined that they didn’t pose a threat. However, they all went on to carry out attacks.
The FBI says it wants to make sure no obvious red flags were missed.