Police in Xi'an, capital of Shaanxi province, have detained two people suspected of using formaldehyde to make noodles.

Police said the provincial Public Security Department received a report from residents on May 20 that a vegetable market in the city's Lianhu district was making noodles with suspicious substances. Lianhu police began an investigation in the market that day.

Meng Jiangwei, an officer at the Lianhu district Laodong Nanlu police station, said they found two noodle-making shops in the market that used formaldehyde as an ingredient.