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A police cordon was put up near the River Medway after two men were found collapsed.
Officers were called to Fairmeadow in Maidstone at around 9.25pm last night.
This followed reports that two people had collapsed and were in need of medical attention.
A spokesperson for South East Coast Ambulance Service said: "Ambulance crews attended the scene and the male patients were assessed and treated at the scene before being taken to hospital in a serious condition."
Police inquiries continued at the site this morning and the cordon has now been lifted.
Mike Walker, who lives at an apartment block which oversees the area, said: "It started off just an ambulance and a police car then I looked out a few minutes later on and there was a huge army of emergency services."
Another resident Cergai Baban said there were three ambulances and seven police cars.