CRYSTAL (AP) — Police in Crystal say they believe the father of a missing 10-year-old boy hasn't been honest about his disappearance.

Barway Collins was last seen after school March 18 near his apartment complex. Police said they were working to find the boy and were checking flights to see whether he might have been sent overseas to his mother, believed to be in Liberia.

Chief Stephanie Revering said Barway's father, Pierre Collins, is now considered a suspect. Revering says Collins was given a lie-detector test and "we believe he was untruthful."

Police released a video of Barway riding a bus after school. In the video, the boy said "there's my dad" and "there's my uncle." Police want to identify the uncle.

No one responded to a message left at Collins' apartment Tuesday.