After years of relative quiet, it appears to have re-emerged in the wake of violent protests in Minneapolis over the death of George Floyd, promising to expose the "many crimes" of the city's police to the world.

Various forms of cyber-attack are being attributed to Anonymous in relation to the George Floyd protests.

A database of email addresses and passwords claiming to be hacked from the police department's system is also in circulation, and being linked to Anonymous.

A page on the website of a minor United Nations agency has been turned into a memorial for Mr Floyd, replacing its contents with the message "Rest in Power, George Floyd", along with an Anonymous logo.

Despite there being no single unified approach among Anonymous' members, the group has targeted groups over race relations in the past.

In 2014, when the shooting of Michael Brown in Ferguson, Missouri, prompted widespread protests, members of Anonymous threatened to target the city if protesters were harmed.

Some Anonymous members also attacked the campaign group Black Lives Matter's website over alleged "anti-white racism"

It is against this backdrop that a Facebook page claiming to be linked to Anonymous released a video about Mr Floyd's death, alleging a string of other crimes involving Minneapolis police, and threatening to act

But it received much wider attention after the Minneapolis police department's website appeared to be knocked offline

The death of George Floyd, a black man, at the hands of police has sparked civil unrest across the US