Chinese authorities in a southern boomtown have detected a cancer-causing toxin in peanuts and cooking oil that was only recently discovered in milk, in the nation’s latest food safety scandal.

The food safety regulator in Shenzhen said it had found excessive levels of aflatoxin in peanuts sold in three stores, and in cooking oil in four restaurants, the official Xinhua news agency said late Friday.

Calls to the regulator — the Shenzhen market supervision bureau — went unanswered.