Examine the tweet "on July 13th,1989 in #Vienna , #Ghassemlou &amp; his fellows was #terror by the agents of the #Iranian regime\n#Iran #Terrorism \n#twitterkurds" and classify its emotional content using these emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If there are no emotions, answer "neutral or no emotion".