In the wake of the CBI website falling prey to cyber hacking, government today issued stringent guidelines making it mandatory for official websites to go for auditing on a regular basis.

"We have issued new guidelines today...the state governments and central government will have to get their websites audited and upgrade their firewalls," Minister of state for IT Sachin Pilot told reporters outside Parliament House.

He said it would be better not to host a "vulnerable" website if it is not audited by experts.

On the cyber attack on CBI website, he said in a "day or two", the logs will explain from where exactly the attack took place. "A self-regulatory mechanism is in place. Now it will be enforced strongly," he said.

Pilot on Sunday had held meeting with officials of NIC, CBI and IT department to trace "concrete data" on the origin of the attack.

The official website of the CBI was hacked by a group calling itself the 'Pakistani Cyber Army' on the intervening night of December 3 and 4.