Web portals of two US banks’ including Bank of America and JPMorgan Chase have recently faced unexplained glitch on their public websites, making them unavailable for its customers, as reported by Reuters.

The websites of the two banks were hacked by an unidentified person, who posted his message and threatened that he will attack BofA and the New York Stock Exchange as a "first step" in a campaign against the US firms.

The cyber criminal further warned that the assault will continue till the film which is making mockery of Islam on the internet is not deleted.

Although the cyber experts of both banks failed to nab or identify the accused, who posted the statement on their sites.

Financial services industry group further hinted that cyber criminals were targeting big banks and their threat has reached from "high" to "elevated" level, which needed to be dealt with utmost caution.

FBI in the US has most recently floated a "fraud alert" suggesting financial services firms that cyber criminals may disrupt service to their websites in an effort to keep banks from noticing a recent surge in fraudulent large-sized wire transfers.