Brad's - Heartbreak OVER PAX

The actor fights to see his son after he's involved in a horrific accident

He wasn't wearing a helmet and witnesses feared he was dead. On July 29, Angelina Jolie and Brad Pitt's son Pax crashed his electric bike into the back of a car at a red light near his mom's LA home during rush hour.

He injured his hip and suffered a serious head injury reports confirmed a brain bleed. "His mouth was filled with blood," Lola Cavalli, who rendered medical aid to the 20-year-old "right in the middle of an intersection" until paramedics arrived, says of the harrowing scene.

Pax was hospitalized and spent a week in the ICU. Reports soon emerged that he'd suffered complex trauma and faces a long road of recovery and physical therapy. While his mother, 49, and siblings, Maddox, 23, Zahara, 19, Shiloh, 18, and twins Knox and Vivienne, 16, have been by his side, a source says his heartbroken father, 60, has been kept away. "Brad is devastated by what happened," says the source.

"He loves Pax. Pax is his son. But Brad can't see him."