New Delhi, Aug 21 (IANS): The central government on Friday said the Delhi government had no power in ordering a probe into the alleged multi-crore-rupee CNG fitness scam and declared its probe panel as "legally invalid".

The decision will add to the already strained relationship between the central and Delhi governments over a host of issues.

The decree was conveyed by Lt. Governor Najeeb Jung, who had sought the central government's opinion over the AAP government's decision to form a commission of inquiry in the alleged scam that took place under the previous Sheila Dikshit-led government.

"It has been clarified that the GNCTD (Government of National Capital Territory of Delhi) is not the competent authority to set up such an inquiry under various provisions of the constitution and the Commissions of Inquiry Act, 1952," a note from the LG's office said.

"The notification issued by the GNCTD has, therefore, been declared legally invalid and void ab initio," it added.

Jung further said the Anti-Corruption Branch (ACB) was looking into the matter afresh.

"Notices have been issued by the ACB to all concerned, including government officers named in the original complaint. The ACB has been asked to complete the investigation on priority," the note added.

A Central Bureau of Investigation (CBI) probe had revealed irregularities in awarding the contract of operation and maintenance of inspection and certification of CNG vehicles -- thereby causing a loss of Rs.100 crore to the Delhi government.