The World Health Organization issued an alert Wednesday over four cough and cold syrups made by Maiden Pharmaceuticals in India, warning they could be linked to the deaths of 66 children in The Gambia.

"Laboratory analysis of samples of each of the four products confirms that they contain unacceptable amounts of diethylene glycol and ethylene glycol as contaminants," the WHO said in a medical product alert, warning that while the contested products had so far been found in The Gambia, they could have been distributed to other countries.