An air ambulance, carrying seven passengers, has crashed landed in a field near Delhi Tuesday afternoon, news reports have said. The air ambulance had taken off from Patna and was en-route to Delhi when it crashed at 2:45 pm. The chartered aircraft reportedly suffered an engine failure following which it made an attempt to land in Najafgarh area. The air ambulance belongs to Alchemist Airlines. Five people have been rushed to hospital and fire engines are at the site.