About a dozen activists converged behind the PIA office in Connaught Place at around 3 pm and started pelting stones and shouting anti-Pakistan, anti-Nawaz Sharif slogans.

No one was injured in the attack and only a few windowpanes of the PIA office were broken, police said. The activists fled within minutes even as PIA officials informed the police control room.

Additional Deputy Commissioner of Police Sanjay Beniwal said police were yet to ascertain who was behind the attack.