The shocking 'news' first appeared on his band Tenacious D's Twitter account on Sunday morning (05Jun16), but it appears the tweet was the work of hackers.

The band later posted a message on the same Twitter account assuring concerned fans the 46-year-old was alive and well.

"WE had our Twitter account hacked," the band stated. "We can assure you that Jack is ALIVE and WELL and that this was a sick prank."

John Konesky, a guitar player with Tenacious D, also confirmed the tweet was the work of a hacker.

Black and his representatives have yet to make a statement.

It is believed the School of Rock star is on his way home to Los Angeles after performing at two music festivals in Germany over the weekend (03&04Jun16).

As thousands of worried fans hit social media looking for more information about Black's apparent death, the hacker returned to the Tenacious D Twitter account and confirmed he or she was joking, adding, "Calm down guys, it's just a prank, bro...", and assured fans, "The Legend is still alive, it is ok guys".

This is not the first time Black has been the victim of an online hoax - in 2012 reports suggested he had fallen to his death from a cliff in New Zealand, while another in 2014 suggested he had died after suffering a stroke.

Black was caught up in another drama during Tenacious D's German trek - Black and his longtime sidekick Kyle Gass performed at the Rock Am Ring festival, which was shut down on Sunday (05Jun16) due to severe storm warnings.