Berlin police arrested a man on Thursday over the disappearance nearly a month ago of a 4-year-old Bosnian boy, and said they found a child's body in the suspect's car.

The 32-year-old man, whose identity wasn't released, was arrested Thursday morning following tips from his family, police said in a statement. They said they were still trying to confirm the identity of the dead child and would conduct an autopsy on the body.

The suspect was being questioned.

The boy, Mohamed Januzi, was last seen on Oct. 1 leaving the central registration center for migrants in Berlin with an unidentified man. The following week, police published photos of Mohamed and a grainy video of a man leading the boy along a street, and the case drew widespread attention in Germany.

On Tuesday, police posted new pictures of the boy and clearer amateur video of the man in hopes of getting new leads. At the same time authorities announced rewards totaling 20,000 euros ($22,000) for information and described the suspect as of European appearance, slim, with dark hair and a beard.

It is unclear how Mohamed became separated from his mother and siblings.

There have been long lines and frequent overcrowding at the registration center this year as Germany struggles to absorb a huge influx of refugees and other migrants, though the opening this month of another facility has eased the pressure somewhat.