Delhi Police Commissioner Amulya Patnaik called on agitating police officers to return to their duties and posts, after his colleagues launched a massive protest outside their headquarters today. The officers were protesting violent clashes between cops and lawyers that broke out on Saturday at the city's Tis Hazari court complex. At least 20 policemen and eight lawyers were injured and 20 vehicles were vandalised in Saturday's clash. That attack was swiftly followed by another violent confrontation - this time outside the Saket District Court - between a single policeman and a group of lawyers.