<p>Chris Brown, 27, was stopped from a potential physical altercation by police at a charity basketball game on the anniversary of 9/11 (video below).</p> 
<p>The singer got into such a heated argument with someone in the stands that the cops were called in to intervene before the situation escalated any further.</p> 
<p>The incident occurred at the Power 106 Celebrity Basketball Game at USC, reports TMZ.</p> 
<p>Video footage shows Brown becoming visibly upset as he leans over the bench seats to argue with a spectator.</p> 
<p>The music was too loud to make out exactly what words were exchanged, but USC cops can be heard saying, &#8220; I don&#8217;t care who&#8217;s here, get it straight.&#8221;</p> 
<p>Brown walked away twice but came back moments later each time to continue the quarrel, according to the Daily Mail.</p> 
<p>At one point, the R&amp;amp;B singer was encircled by cops as he tried to explain the situation.</p> 
<p>Brown has become the latest high-profile star to join Colin Kaepernick&#8217;s national anthem protest against police brutality and racial inequality in America.</p> 
<p>Before the basketball game, Brown did not observe the anthem. Instead, Brown laughed with friends as he sat during the song&#8217;s performance.</p> 
<p>The anthem was sung by R&amp;amp;B singer Tank, who asked the audience to stand &#8220;in the wake of 9/11&#8221; and in respect for those who lost their lives in the September 2011 terrorist attacks.</p> 
<p>However, Brown applauded Tank at the end for his effort.</p> 
<p>Brown was arrested just last week after a standoff with police officers at his Tarzana home over allegations he threatened a woman with a gun.</p> 
<p>During the event, Brown posted videos on social media in which he denounced the police and said he was being unfairly demonized.</p>
Chris Brown Laughs During National Anthem & Refuses To Stand, Has Unexpected Encounter After (Video)