Marathon Investigation at Jackson Home

DCFS social workers arrived at 4 PM yesterday and left at around 10:30 PM -- 6 1/2 hours later.

As we first reported, DCFS showed up the night before after receiving a tip that Jermaine Jackson's 13-year-old son, Jaafar, was playing with a stun gun on the second floor of the residence.

Sources tell us the social workers are interviewing all of the children in the house -- including Michael Jackson's 3 kids -- along with other family members and staff. We're told DCFS is taking the investigation very seriously and the plan yesterday was to come back today as well.

Sources say some of the individual interviews have taken a long time and there is a lot of tension on the property.

We've learned there's a conflict among people who live and work at the property. We know some members of the staff will tell DCFS that the stun gun was there for several days, before a member of security went upstairs and allegedly found Jaafar and other kids playing with the gun and pointing it at Michael's sons Blanket and Prince.

Katherine Jackson's lawyer, Adam Streisand, insists Blanket and Prince were never in the room with the gun and that Jaafar was playing with the gun for a few minutes -- not days -- before it was confiscated.

Some members of the staff will tell DCFS there is a second stun gun on the property. Streisand says that is absolutely not true.