The Los Angeles County Department of Children and Family Services (DCFS) has reportedly extended its investigation into child abuse allegations against Brad Pitt after reports emerged that the actor, 52, turned violent toward his 15-year-old son Maddox aboard a private plane from Europe to L.A. on Sept. 15.

“They are looking at a history and pattern of behavior,” a source told US Weekly. “They are looking at not only the original incident but other possible incidents surrounding it and more history.”

However, another source told the magazine that it is standard procedure and there were no additional charges being looked at. The legal source said, “It’s normal [for the DCFS] to extend past the deadline to complete their work when an agreement exists between the parties.”

Two FBI agents visited Pitt's estranged wife Angelina Jolie at her Malibu home Oct. 18, and questioned several witnesses for over three hours, E! News reported. There are expected to be more witness interviews but the investigation may conclude soon, after which reports will be sent to the U.S. District Attorney who will decide whether to press charges against Pitt.

Jolie, 41, filed for divorce Sept. 19, citing irreconcilable differences with the actor. Under a temporary agreement, she was granted full custody of their six kids — Maddox, Pax, 12,  Zahara, 11,  Shiloh, 10, and twins Knox and Vivienne, 8 — while Pitt retained visitation rights.

Maddox reportedly refused to visit his father initially but reunited with him last week, in the presence of a therapist.

brad kids Brad Pitt and Angelina Jolie are seen after landing at Los Angeles International Airport with their children (left to right) Pax, Maddox, Vivienne, Shiloh and Knox, Feb. 5, 2014. Photo: GC Images/GVK/Bauer-Griffin

The DCFS’ decision will not affect the couple’s divorce and custody agreement, which remains to be decided in family court. An insider told the Weekly the actress “is not trying to poison the kids against Brad… She wants them to have a relationship with him once their health and safety is assured.”

Another source told the NY Daily News that Pitt never got physical with his children, but admitted to an incident taking place.

“While this was not his best moment, it’s being inaccurately described. He certainly could have behaved better, but there was no physical abuse,” the source said