India, July 8 -- The investigation into a child trafficking racket busted last month, in which seven newborns were rescued, has hit a roadblock. On one hand, investigators have been unable to locate the biological parents of rescued newborns; and on the other, while they have found some couples whose babies are missing, they haven't been able establish if these couple are linked with the trafficking network.

Police, however, said on Tuesday that they have developed "strong leads" and are examining one or two couples who may be the biological parents of two of the rescued babies.

In mid-June, Delhi Police said they had busted a child trafficking syndicate allegedly operating out of Hira's multi speciality hospital in Rohini's Begampur ar...