A joint army and police patrol arrested three suspects who allegedly used two cars and a van to transport the refugee group, the Serbian defense ministry said on Tuesday.
Authorities discovered 34 people inside the van, including young children, a baby, and a pregnant woman. The remaining 30 Afghan migrants were waiting nearby to be transported in the passengers cars.
The security forces discovered the van at Zajecar, which is only 15 minutes away from the Serbian border with Bulgaria.
All three of the suspects were from Belgrade, according to Serbian authorities. They were in custody and awaiting a court hearing on Tuesday afternoon.