The Indian state of Kerala is refusing to give up in its bid to keep its ban on Coca-Cola and PepsiCo drinks over allegations they contained pesticides.

Kerala's communist state government imposed the ban in August after the New Delhi-based Centre for Science and Environment said Coke and Pepsi drinks contained illegal levels of pesticides.

However, Kerala's high court overturned the ban a month later, ruling that the ban was unconstitutional and that the products were safe to drink. Now, Kerala's state government has appealed to India's Supreme Court to re-impose the ban, according to local reports yesterday (4 December).

A panel set up by the India's federal government also cast doubt on the CSE's claims and said there were inconsistencies in its chemical analysis of the soft drinks.

Nevertheless, the environment group has stood by its report, despite the government panel findings and the court verdict.

Coke and Pepsi have insisted their products were safe to drink. Pepsi embarked on an ad campaign to convince Indian consumers of the safety of its products.