Widening probe into a case in which a senior Army officer was arrested for allegedly uploading obscene photographs and clips involving children on internet, police are verifying if he was part of a world-wide child pornography racket and did this for monetary gains.

Lt Colonel Jagmohan Balbir Singh (42), hailing from Punjab and posted in the city, was nabbed from his residence in South Mumbai on Thursday and was remanded in police custody till May 12.

"We are verifying if there are any monetary transactions after Singh uploaded the photographs and clips of pornographic contents," a police official said.

They were going through the officer's bank account details, the policeman said, adding "If Singh is found to have had any monetary gains then it will enable us to establish his role in the wide spread child pornography gang."

Singh has been booked under Section 67 (B) (Punishment for publishing or transmitting of material depicting children in sexually explicit act, etc. in electronic form) of Information Technology Act.

While looking for internet-related offences, German police came across obscene contents being uploaded on a child pornography site from Mumbai. They brought the issue before the Interpol, which informed the CBI in Delhi in March 2010.

The CBI brought this issue to Mumbai police.

Singh, who is with the Army's Supply and Transport wing in Colaba, South Mumbai, was nabbed on May 6.