The Department of Children and Family Services have reportedly extended their investigation into Brad Pitt.

Brad Pitt and Angelina Jolie

Brad Pitt and Angelina Jolie

Angelina Jolie, Brad and their children - Maddox, 15, Pax, 12, Zahara, 11, Shiloh, 10, and eight-year-old twins Knox and Vivienne - were previously interviewed after an alleged altercation on a private plane between Brad and Maddox and TMZ reports that the "DCFS has now expanded its investigation to other alleged incidents".

The reported incident on the plane - where Brad is alleged to have gotten "verbally abusive" and "physical" with his son while under the influence of alcohol - occurred on September 14 and Angelina filed for divorce just days later.

However, it was later reported that "Maddox suffered no injuries and some witnesses on the jet say Brad's contact with the boy was inadvertent".

Angelina and Brad agreed on a parenting plan, giving Angelina temporary physical custody over the kids with Brad allowed to visit them under the supervision of a therapist.

He also offered to be randomly tested for drugs or alcohol to prove he is not dependent on either.

The parenting plan was originally put in place until October 20, when social workers were set to decide what to do next after hearing from the therapist and taking a look at Brad's drug test results.

Referring to the extension of the investigation, a legal source told PEOPLE: "They are looking at the original inciting incident and anything surrounding that, and looking at any relevant history."

Another legal source added: "Things remain in a holding pattern at this point and are ideally nearing a conclusion. This investigation has always been and continues to be open-ended.

"People have erroneously made the assumption that he original October 20 date of the agreement between the two parties was also in some way a deadline for DCFS, and that is simply not the case.

"The parties reached an initial agreement and standard operating procedure is that a DCFS investigation is open-ended; DCFS is under no deadline and there is no delay here, simply a continuation of an ongoing process."

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