Prosecutors in Paris have opened investigations into five baby formula manufacturers after several issued mass recalls over concerns their product contained a toxin. Nestle, Lactalis, Danone, Babybio and La Marque en moins will be probed over whether there was any criminal wrongdoing in distributing baby formula that may have been contaminated with cereulide. French authorities have received complaints from eight individuals who reported their child vomited after consuming baby formula. Last week, Nestle and Danone issued recalls in more than 60 countries, including the UK, over potentially contaminated batches. At least 36 infants in the UK have suffered from suspected food poisoning after consuming baby formula, officials have confirmed. Cereulide is a toxin unlikely to be destroyed through cooking or when making baby milk, potentially causing nausea, vomiting, and abdominal cramps. It was linked to an ingredient known as arachidonic acid (ARA) oil, which mimics some growth properties of breast milk. The UK Food Standards Agency (FSA) indicated that a third-party supplier of ARA had been identified as the source of the contamination, and this supplier is believed to be the Wuhan-based Cabio Biotech. On Thursday, China's national market regulator advised domestic baby formula manufacturers to test for cereulide without naming specific companies. Prosecutors in Paris will also investigate if the baby formula producers are liable for distributing a tainted product, amid co-ordination with local investigations concerning a potential causal relationship between the contaminated formula and the deaths of three infants in France. Nestle and France's health ministry have emphasized that there is currently no evidence linking the two. Thus far, 28 batches of baby formula produced by Nestle and Danone have been recalled. Both companies assured the FSA that the recalled batches were produced some time ago and unlikely to remain on UK store shelves, but urged parents to check their supplies at home. Following the global recall, Nestle announced plans to keep five of its factories running around the clock to ramp up baby formula production across France, Spain, Germany, Switzerland, and the Netherlands, expressing a commitment to increasing the availability of quality infant formula.