President of the Royal College of Emergency Medicine, Dr Clifford Mann, has said it "comes as no surprise" that A&E departments in England are now performing at their worst level since February 2010.
Newly-released figures show just five out of the 138 trusts in England met the government's target of seeing 95 per cent of A&E patients within four hours.
Dr Mann said staff working in emergency departments are under "relentless pressure" and the college is becoming "increasingly concerned about the risk of burn-out for the medical and nursing teams working so hard to deliver the service."
It is now routine for many staff to arrive at work faced with congested and overcrowded departments in which it is impossible to deliver best care. Similarly many leave work, hours after their agreed finish time, exhausted by the scale of the task.
The College is in regular dialogue with the Department of Health, NHS England and NHS Improvement.
Urgent action to increase capacity within A&E departments is the focus of these discussions."
Lancashire NHS Trust said they do not have enough emergency doctors and "there are no other safe options for delivering care".
The cracks are showing in England's struggling A&E departments, writes Rachel Younger - and the latest figures show how deep they go.
Accident and emergency services in England suffered their worst monthly performance since 2010 in February, new figures reveal.