Handout image obtained on June 30, 2009 from WireImage shows Michael Jackson during rehearsals for planned shows at Staples Centre in Los Angeles, 23 Jun 2009The head of a concert promotion agency says a tribute to late pop starMichael Jackson will likely be held at the Staples Center arena in LosAngeles.

Randy Phillips, head of the promotion company AEG Live,said Thursday that the family is considering holding the event onTuesday but has not made a final decision. He said admission will befree.

AEG Live was the company producing a series of "comeback"concerts featuring the late star, which were set to begin this month inLondon. Now it is expected to produce the memorial event, afterJackson's sudden death on June 25.

Also Thursday, the biologicalmother of Jackson's oldest two children hinted that she may press forcustody. Debbie Rowe told a Los Angeles television news program thatshe wants her children.

But her lawyer said later that Rowehas not reached a decision about asking for custody. Jackson asked inhis will that his 79-year-old mother be made their guardian.

And U.S. media report the Drug Enforcement Administration (DEA) has joined the investigation into Jackson's death.

Investigatorsremoved two large bags of medical evidence from Jackson's rental home,where an emergency caller reported that the pop icon had stoppedbreathing.

A medical examiner found no external signs of foulplay and investigators are now waiting for the results of toxicologytests, which are expected to take weeks.

On Wednesday, Jackson's2002 will was filed in court and estimated his fortune to be worth $500million at the time, with the estate to be put into a family trust, andguardianship of his three children.

Some information for this report was provided by AP and Reuters.