NEW DELHI: Police investigators put Umar Khalid , a former member of the Democratic Students' Union and organizer of the pro-Afzal Guru event in Jawaharlal Nehru University , through "sustained interrogation " on Wednesday to ascertain the identity of some men present at the event who are suspected to be of foreign origin. Videos have shown them with faces covered by mufflers and shawls and shouting anti-India slogans.The questioning was based on two fresh videos that have surfaced, one of which shows people who do not belong to the university at the event, while the other has arrested JNUSU president Kanhaiya Kumar admitting that outsiders had raised the anti-India slogans and that he condemned it. However, despite the police's efforts, Khalid and his associate Anirban Bhattacharya had not identified any of the masked men till late on Wednesday.On Wednesday morning, the police produced the two students before a magistrate and asked for permission to keep them in remand for a week, but the court granted only a three-day custody.The cops had a tough time quizzing Khalid and Bhattacharya after they surrendered on Tuesday around midnight. By narrating in detail the concept of subaltern studies and development concepts in south Asia when asked what they did at JNU, the two left the team of an inspector and two sub-inspectors befuddled. A three-member team headed by an ACP was constituted to ask them specific questions.Khalid answered most of the questions in a vague manner, while a calmer Bhattacharya answered only a few of the posers thrown at him. When they were asked about their motive in organizing such an event on the campus, the JNU students talked about folk history and narratives from the viewpoint of the people and about class exploitations.The two were asked about their associates/co-organizers and the specific roles they had played in the February 9 event. The police also wanted to know about their finances and phone calls. Khalid told the police that he and Banajyotsna Lahiri, a former JNU student and now a lecturer at Ambedkar University Delhi, had conceived of the programme and held several meetings with DSU members on this.Throughout the questioning, Khalid kept on insisting that the controversial slogans had not been raised by them, but by outsiders whom he did not recognise.Bhattacharya claimed that he had been asked to handle the publicity for the event through handbills and posters. As for the funding of the event, the pair denied the involvement of any external agency and said they had jointly borne the expenses of around Rs 4,000.The cops then enquired whether the two of them had distributed videos of the event, but the students said the videos they disseminated had not contained any anti-India sentiments. Police are on the lookout for someone named Riyaz, who they believed had arranged for the public-address system and had also been responsible for uploading photos and videos on social media platforms.Khalid, who is working on tribal history as part of his doctorate studies, maintained that he had not invited people from other universities or outsiders to participate in the event. According to him, discussions regarding Afzal Guru's death were held every year. The police now plan to confront the two with Kumar to verify their versions of what happened on February 9.