The new information came a day after the agency suggested it could be out of the hands of anyone else involved.
The FBI Supervisory Senior Resident Agent Leah Greaves said last week that investigators are working to determine if a second person is interested after the shooting at Naval Air Station Corpus Christi.
One sailor was injured in the attack and the gunman was killed. The FBI left Ton behind in their initial assessment that a second person was also involved in the shooting.
Federal Bureau of Investigation Now says there is no second person involved after an intense investigation.
The agency added that the shooting was being investigated as a “terror-related incident”, without explaining what it meant. Well, if something in the past continues, a panic attack could give the agency a wider latitude of investigation.
Two officials familiar with the investigation previously told the Associated Press that agents were examining social media posts to see if they believed the shooter had expressed support for extremist groups, including al-Qaeda, in the Arabian Peninsula.
Authorities identified the gunman as 20-year-old Adam Selim Alsahali, a resident of Corpus Christi. Adam was also a student at a local community college.
He was shot dead by security officials after he opened fire while trying to drive a truck through the base entry gate.