New Delhi, Sept. 7 -- Five people were killed, five were injured and an unknown number were feared trapped after a five-storey building in Satya Niketan that housed Delhi University students collapsed on Sunday, another in a run of tragedies that has shaken the national capital this year and turned the spotlight on the city's frail infrastructure, poor regulatory regimes and the near-absence of a monitoring mechanism to crack down on violations. Police said renovations were underway in the ground floor of the paying guest accommodation, known as Hostel Daze, triggering the collapse around 1.30pm. The building was between 40 and 50 years old, said officers. Investigators said the building was owned by Hariram Bansal, a resident of Gurugram, and registered an FIR against him and unidentified others under sections 105 (culpable homicide not amounting to murder), 290 (negligent conduct with respect to pulling down, repairing or constructing buildings), and 125 (act endangering life or personal safety of others) of the Bharatiya Nyaya Sanhita (BNS) at the South Campus police station. Delhi chief minister Rekha Gupta ordered a magisterial probe into the collapse. Thirteen people were pulled out as of 11.30pm, of whom five were confirmed dead. Two of them were identified - Abhishek, a student of Motilal Nehru College, and Yuvraj. Of those rescued, five were being treated at AIIMS in Delhi and one at Safdarjung Hospital. As of midnight, officials said several people were still likely trapped, with personnel from the police, Delhi Fire Services (DFS) and Delhi Disaster Management Authority (DDMA) combing through the rubble. A clutch of students caught in the mounds of concrete, brick and rebar, made desperate calls for help to their friends and relatives, while others circulated videos from within the debris to draw the attention of rescue workers. HT received an 11-second video from students recorded by a person caught in the debris. It showed a man bleeding and trapped between large blocks of concrete. By evening, it emerged this man, who was identified as Aditya Kumar, a DU student, was alive and stable, his brother Ankit Kumar said. Condolences poured in from across political circles. Prime Minister Narendra Modi called the collapse distressing and Delhi chief minister Rekha Gupta supervised the rescue operation. Most residents studied at three Delhi University colleges in the vicinity - Sri Venkateswara College, Atma Ram Sanatan Dharma College and Motilal Nehru College - and came from Uttar Pradesh, Haryana, Jammu and Kerala, said local residents. Nitin Jamwal (19), a student of Motilal Nehru College who lived at the hostel until about a year ago, said: "Everything here was bad. The walls were cracking, the basement used to fill up with water." His friend Niteesh Chib was among those initially trapped in the collapse. He was later rescued, said Jamwal, who now lives in another PG accommodation in the vicinity. The building, opposite Sri Venkateswara College, is one of dozens of PG accommodations in the congested resettlement colony built without any planning or layout norms....