The two artists were recording at Westlake Recording Studio in Hollywood, and authorities say that as many as ten shots were fired during the incident.
Rich the Kid reached No 2 in the USA charts previous year with his debut album The World is Yours, which featured the hit single Plug Walk. The shooter was running away from the studio as he fired shots behind him.
Usher, Rich the Kid, and their entourage came under attack on Tuesday.
Rich's entourage members were also ambushed, and only one bodyguard was hit.
Witnesses told TMZ that as many as 10 shots were fired outside the Westlake Recording Studio.
Ex-boyfriend of woman found dead in suitcase held without bail
Reyes lived alone in a basement apartment in New Rochelle and suffered at times from anxiety and depression, WABC reported. Valerie Reyes , 24, has been found dead in CT after being reported missing in New Rochelle, police say.
Police are now canvassing the area for suspects.
Just hours before the robbery, Rich coincidentally posted an Instagram photo of himself holding stacks of cash while standing in front of a Lamborghini.
It appears that Rich The Kid is a magnet for robbers. Other famous musicians such as Quincy Jones, Billy Idol, Missy Elliot, Madonna, Justin Timberlake and Marilyn Manson have also recorded music at the location.
Furthermore, it is believed, as per TMZ, that 'the suspect or suspects made off with a ton of cash and jewelry'.