WASHINGTON, Feb 4: The requirement for male visitors from several Muslim countries to register with the Immigration and Naturalization Service (INS) while in the United States has resulted in the arrest of at least six terror suspects, a US official told Dawn on Tuesday.

“Yes, there are some terror suspects among the 400-plus ... we have detained during this process,” Justice Department spokesman Jorge Martinez confirmed.

Diplomatic sources, however, said there were six terror suspects detained — all of them from Middle Eastern or Muslim countries.

The National Security Entry-Exit Registration System was launched on Sept 11 last year.