This video from the USA says about itself:
25 November 2014
Social media has been set ablaze after the police officer, Darren Wilson, who shot and killed an unarmed Michael Brown was not indicted by a grand jury in the murder trial in Ferguson, Missouri yesterday and big stars are now reacting differently from all over the world. Rihanna, Nas, Alicia Keys, Pharrell Williams, Gabrielle Union, Keri Hilson, Katy Perry, Michelle Williams, Ludacris and many more jumped on social media to air their views on the shocking verdict which has now left the city of Ferguson in complete violence.
RiRi posted a picture on her Instagram of a board which read: ‘Justice for – (I left it blank) because I’ll probably need this next year‘ and captioned it “Fact”.
From daily The Guardian in Britain:
Singer had planned to walk with protesters and give free concert for 25-year-old African American man who died in police custody
Wednesday 29 July 2015 12.34 BST
According to newly released emails between police and the singer’s representatives, obtained by the Baltimore Sun, Rihanna wanted to go to Baltimore in the week after race-related rioting broke out, to walk with protesters and perform a free concert.
In a message dated 1 May sent to Captain Eric Kowalczyk, the then head of media relations for Baltimore police, an officer detailed a conversation he had with a representative for the singer. He said the representative advised that Rihanna would arrive by plane and “in an effort to divert press/media she will be travelling to the city by train (or by car if necessary)”.
The officer added that the representative “had hoped to secure some extra police security and was directed by the governor’s office to seek assistance through communications”.
The email was forwarded to Anthony Batts, the then Baltimore police commissioner, and Kevin Harris, a spokesman for the mayor of Baltimore, Stephanie Rawlings-Blake.
The possible concert was also mentioned in a situation report on 1 May, which revealed the location to be the intersection of Pennsylvania and West North avenues, the focal point of the protests. “Possible Rihanna Concert at Penn & North,” it read. “No time given. Police are claiming they have no permit so it will not be allowed.”
A state of emergency was declared in Baltimore amid widespread civil unrest across the city following Gray’s death, which a medical examiner ruled was a result of spinal injuries inflicted by arresting officers. Criminal charges including murder and manslaughter have since been brought against the officers involved.
Other musicians who expressed concern about the situation included Kelly Rowland, Gerard Way, and Prince, who played a show at the city’s Royal Farms Arena on 10 May. The concert, Rally 4 Peace, was broadcast live by Tidal, the livestreaming company backed by rapper Jay Z.