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[Read more: Exclusive: Who are 'Mallu Cyber Soldiers' that hacked Pakistan websites]

In response to the cyber attack on the Kerala government website by Pakistan-based hackers, an anonymous Indian cyber group has retaliated by hacking into scores of official Pakistani websites.

On Sunday morning, the Kerala government website was crashed by Pakistani hackers, who posted image of a burning Indian flag. The hackers had left messages such as "Pakistan Zindabad", "We are Team Pak Cyber Attacker" and "Security is just an illusion".

However, hours later, the Kerala-based 'Mallu Cyber Soldiers' hacked into Pak government websites, warning the pro-Pakistan hackers to "stay away from Indian cyber space".

The sites crashed by Indian hackers include pakistan.gov.pk, president.gov.pk and cabinet.gov.pk.

However, this is not the first time that the Mallu Cyber Soldiers has hacked Pakistan websites in retaliation.

In October 2014, actor Mohanlal's website was hacked by a group known as Cyber Warriors, who had posted several "Free Kashmir slogans" and warned Indian Army about their activities in the Kashmir valley.

However, in retaliation the 'Mallu Cyber Soldiers' hacked several official Pakistani websites like National University of Modern Languages, Lahore campus (NUML) and Pakistan Electric Power Company (PEPCO).