JNU students Umar Khalid and Anirban Bhattacharya, accused of sedition, surrender before the Delhi Police; Prime Minister Narendra Modi tells BJP lawmakers to "aggressively debate" the JNU issue in Parliament; Delhi Police arrests Yashpal Singh, one of the lawyers who was caught on camera attacking teachers, students and journalists at the court hearing in the JNU case in Delhi last week; and more on the news wrap of the day.