Dogs picked up the boy's scent near the Hudson River Wednesday, but there was no sign of him. Dive teams searched the river again Thursday.
Bookal was last seen early Monday afternoon. He is 3-foot-5 and weighs 42 pounds.
Cory Byrd, his mother's boyfriend, has been arrested charged with child endangerment. Byrd claims the boy wandered away from the house.
Earlier that morning, the two were seen on surveillance video at a nearby bodega.
This isn't the first time Byrd has been jailed.
Byrd was arrested in 1998 after his own son was hospitalized with a fractured skull, broken ribs, a broken wrist and perferated liver. He was charged with reckless endangerment after a number of inconsistaces in his story.
This time, he remains in custody, has asked for a lawyer and is not talking. But Marc's mother is supporting him.
"Marc and him had a good relationship," Christina Bookal said. "I'm not a stupid mother."
Marc Bookal suffered burns to his hands, which his mother claims was an accident, a story that has been met with skepticism by many in the community.
Marc Anthony was last seen wearing a red, long-sleeve shirt, white Nike Uptown sneakers and gray Rocawear sweatpants. He is light skinned, wears his hair in a medium length afro and has discolorations on the back of each hand from the previous burn injury.
Anyone with information is asked to call the Newburgh Police Department or 1-800-FIND-KID.