There has been simmering anger among young lawyers since 20 November when half a dozen of them accompanied a colleague to the hospital for the treatment of his sick mother, says the BBC's M Ilyas Khan in Islamabad.

There they got into an argument with hospital staff and a doctor on duty, leading to a fierce fist fight in which the lawyers were outnumbered by the hospital staff.

But tempers ran high, and both sides got their respective professional associations involved to bring pressure on the police to arrest members of the opposing party.

This forced the provincial authorities to intervene and an agreement was reached on Tuesday under which the hospital staff agreed to apologise to the lawyers while the lawyers agreed to withdraw their complaint.

But at that moment, the video of a young doctor bragging about how the lawyers involved in the 2 November episode had been humiliated was posted on social media and went viral, our correspondent adds.

An angry meeting of the lawyers took place at the bar council's office on Wednesday morning, where many of them decided to march on the hospital about 3km (two miles) away.

Footage on social media shows a lawyer walking ahead of his marching colleagues and addressing the doctor in the earlier video, inviting him to see the "sea" of lawyers heading towards him.

According to hospital administrators, more than 200 lawyers wielding sticks stormed Lahore's Punjab Institute of Cardiology (PIC) at midday on Wednesday.

Hospital officials said the lawyers forced their way past security and split into groups, attacking various departments and wards.

Video footage shared on social media showed lawyers - in suits and ties - smashing medical equipment and windows, and beating up staff and officials including Punjab information minister Fayazul Hasan Chauhan who had arrived on the scene to try to restore calm.

(http://www.autoadmit.com/thread.php?thread_id=4400001&forum_id=2#39255448)