Hackers have cloned the Android app of rapper Jay-Z and inserted messages criticising the US government.
The official app is being used by the rapper as a way to promote his latest album – Magna Carta Holy Grail.
Cloned versions of the app available via unofficial sites contain code that unlocked anti-Obama messages on 4 July. The attack is believed to be part of protests against US government surveillance programs revealed this month.
Security firm McAfee discovered the app on third-party Android app sites.