Mohammad Siddiqui (48), his wife Parveen Bano (38), their son Sazid (19), and daughters Asia and Alia, aged seven and three years respectively, were detained by Ghaziabad police from their house at Ali Prem Garden in Sahibabad area.
During interrogation, Siddiqui told police that before coming to India, he was in the Bangladesh army from where he was cashiered for indiscipline.
After that he sneaked into India with his wife.
In 2006, he was caught by Delhi Police and deported to Bangladesh but he again came back.
All four of his children were born in India.
Inspector Upendra Yadav of the Sahibabad police station they were detained as police did not find any valid document with them. The family will be produced in a court later.