Pakistani officials, who wished to be anonymous, have confirmed that at least two people have been detained. However, they refused to divulge any further details on the detained.
According to sources, a man identified as Tauseef Ahmed was one of the two detained.
Sources said that Ahmed's links with Shahzad were established as he had been in touch with the Pakistani-American terror suspect in the recent past.
Ahmed had even gone to the US sometime back on Shahzad's invitation, sources added.
On the second detainee, the sources said that the person was related to 30-year-old Shahzad.
Shahzad Faisal was arrested on Monday, May 3 night at the JFK airport. With the arrest, the Pakistani link emerged.
According to the FBI, the suspect has admitted to plotting the Times Square bombing and that he underwent training in Pakistan's Waristan.
Pakistan has reportedly promised United States its co-operation in the probe of the New York bombing plot.