INDIANAPOLIS (AP) _ Indianapolis police say the abduction of two teenage siblings who were taken to Michigan and later released unharmed is believed to be drug-related.

Police said in a Tuesday statement the siblings are now in child welfare authorities' care “until detectives can determine they are no longer in danger.''

Sixteen-year-old Aaron Blackwell and his 13-year-old sister, Emma Blackwell, were abducted at gunpoint by three men from their Indianapolis home early Monday.

Police issued an Amber Alert later Monday, saying the teens were in “extreme danger.'' But the siblings were released unharmed hours later.

Police said in Tuesday's statement that the youths' abduction remains under investigation but detectives believe it is “narcotics related, and the children were specifically targeted by their abductors.''

Three suspects were in custody Tuesday in Michigan.