A search and rescue operation is under way after police said a number of people were pulled from a lake near Solihull in freezing temperatures in a critical condition.
West Midlands Fire Service said reports suggested people had been playing on the ice at Babbs Mill Park, and fell through.
It said people had received medical support before being taken to hospital.
Emergency service workers have gathered on Fordbridge Road in Kingshurst.
The fire service said it was leading the rescue operation, and that further details would be released when appropriate.
Concerned members of the community gathered near the scene in what is residential area, as emergency services carried out work at the lake.
A drone was also spotted flying over the water, a BBC Midlands Today reporter at the scene said.
It was likely that the emergency service presence would remain there for a number of hours, they added.
Babbs Mill Park is a local nature reserve with a lake, river, wildflower grasslands and woodlands.
Temperatures of 0C (32F) are currently being reported in the area and are expected to plummet to -3C (26.6F) during the night.
The incident came as police in Cumbria said they were dealing with an “incident” at Siddick Pond in Workington.
