Congress Vice President Rahul Gandhi has attacked Centre over the arrest of JNU student leaders following the anti-India slogans incident in the university. <br/><br/>Addressing the students in the campus Saturday evening, Mr. Gandhi said suppressing the voice of students is anti-national act and government is making the students stronger by crushing them.<br/><br/>Left leaders Sitaram Yechury and D Raja, JD(U) leader K C Tyagi and others also addressed the students who were gathered to protest against the arrests into the controversy.<br/><br/>Earlier, some students showed black flags to Rahul Gandhi protesting his visit in the campus.<br/><br/>Meanwhile, ex-servicemen have threatened the JNU administration saying that they will return their degrees to the university if it allows anti-national activities in the campus.<br/><br/>In a letter to University Vice Chancellor, the ex-servicemen of 54th NDA course said the patriotic retired Officers feel that the present activities in the campus negate the sacrifices made by the past degree holders.<br/><br/>The controversy interrupted over an event held in the University campus against the hanging of Parliament attack convict Afzal Guru.<br/><br/>Delhi Police have arrested JNUSU President Kanhaiya Kumar and others over the sedition charges.