According to TMZ, Justin Bieber who is now in Rome was interrogated by the Italian police on Wednesday, 29th April, outside his hotel due to an outstanding warrant under the Interpol list. The source from TMZ said that the warrant was related to an incident in Argentina where he did not appear to answer charges of getting his bodyguard to beat up a press photographer while in Buenos Aires back in 2013.
TMZ further explained that the photograph of Bieber outside the hotel pictured below was taken when his security team were discussing crowd control with the Italian officials. The report however stated that there was no arrest and Justin is still in Rome. But, Italy and Argentina has extradition treaty and should the Argentinian authority decide to have him answer the charges in Argentina, there will be no escape for Bieber this time around.