内容摘要：Anyone who saw the what happened or has footage is being asked to contact the force.

Anyone who saw the what happened or has footage is being asked to contact the force.

Monitors recorded pollution levels of 1,500 on the Air Quality Index (AQI) at 15:00 IST (09:30 BST), according to tech company IQAir - 15 times the level the World Health Organization (WHO) considers satisfactory for breathing.The toxic air has disrupted flight services, and had already prompted authorities to shut schools and ban construction work in the city.

It comes just weeks after Lahore, in neighbouring Pakistan, also recorded pollution levels above 1,000.And experts warn that the situation could get worse in Delhi in the coming days, saying more severe measures may be needed to combat the city's pollution problem.According to the WHO, air with AQI values above 300 are considered to be hazardous for health.

India's pollution control authority has classified the air in Delhi as "severe plus", after the city passed 450 according to its measurements on Monday morning.As well as shutting schools and banning construction work, the city has also banned the entry of non-essential trucks into Delhi and has asked all offices to ask 50% of their staff to work from home.

Last week, the government banned all activities that involve the use of coal and firewood, as well as diesel generator use for non-emergency services.

Every year, Delhi, India's northern states and parts of Pakistan battle hazardous air during the winter months of October to January due to plummeting temperatures, smoke, dust, low wind speed, vehicular emissions and crop stubble burning.Mr Rice's petition has been signed by more than 5,000 people as of Wednesday.

"I've hit them but I don't think I've knocked them out," he said.He previously told the BBC the unit needed to stay open to

AWP said in a statement it recognises "the impact Acer has had for those individuals and families who have used it"."We will share further details about this process which will include staff, patients, partners, stakeholders and the wider community, as soon as possible," it said.