The Delhi Police on Saturday arrested a 19-year-old man who posed as an All India Institute of Medical Sciences doctor for over five months and even participated in events meant for medical professionals.

Adnan Khurram used a fake identity to make friends across departments, the Hindustan Times reported on Monday. The police said they were yet to ascertain why he posed as a doctor, as he reportedly kept changing his statements. In one statement, Khurram claimed he did so to help an ailing relative, while in another statement, he said he posed as a doctor as he liked the profession and wanted to spend time with other doctors.

The impersonation came to light after hospital authorities and members of the Resident Doctors’ Association released his pictures online, and the hospital’s security caught him, DNA reported.

Resident Doctors’ Association president Harjit Singh told the Hindustan Times that Khurram would roam around the campus wearing a lab coat and stethoscope. “We found out he had made different claims to different doctors. To some, he would claim he was a junior resident doctor while to junior resident doctors, he would introduce himself as an undergraduate medical student,” Singh said. “He even made his way into the WhatsApp groups.”

Deputy Commissioner of Police (south) Romil Baaniya said Khurram was charged for impersonation and forgery.