West Midlands Ambulance Service are warning people to avoid swimming in lakes, rivers and other open water.
It comes after 17-year-old Russell O'Neill died at a quarry near the Malvern Hills in Worcestershire at the weekend.
The Ambulance Service is urging people not to risk their lives.
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His victim, who was bed ridden, died four weeks later.
Police say that although the robbers made off with cash, nobody was injured in the siege.
Dry with sunny periods, although cloudier in south this morning.