The shooter whose bullets struck a National Security Agency (NSA) building in suburban Maryland on Tuesday is now in custody, according to the FBI.

Bureau spokeswoman Amy Thoreson said that the unnamed subject was believed to be responsible for shots fired on the Intercounty Connector highway near the spy agency’s headquarters as well as “other locations around the Baltimore-Washington metro area in the last two weeks.”

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It remains unclear whether or not the NSA’s headquarters in Fort Meade, Md., was specifically targeted in the shooting.

The FBI took over the investigation of the shooting late on Tuesday, after an initial investigation from the U.S. Park Policy and NSA police.

No agency personnel were injured during the incident.

According to media reports, a truck traveling eastbound on the Maryland highway was struck by gunfire on Tuesday afternoon, shortly before the NSA building was similarly hit by bullets. The two truck drivers reported minor injuries.

The Baltimore Sun reported late on Tuesday that authorities were investigating whether the shooting was connected to a string of five incidents in nearby Maryland counties, including shots fired at a vehicle driving through the Arundel Mills shopping complex last week. No one was seriously hit in any of those incidents.