As many as 30,000 people could have been killed in the streets of Iran on Jan. 8 and 9 alone, two senior officials of the country’s Ministry of Health told TIME—indicating a dramatic surge in the death toll.

So many people were slaughtered by Iranian security services on that Thursday and Friday, it overwhelmed the state’s capacity to dispose of the dead. Stocks of body bags were exhausted, the officials said, and eighteen-wheel semi-trailers replaced ambulances.

The government’s internal count of the dead, not previously revealed, far surpasses the toll of 3,117 announced on Jan. 21 by regime hardliners who report directly to Iran’s Supreme Leader Ali Khamenei. (Ministries report to the elected President.) The 30,000 figure is also far beyond tallies being compiled by activists methodically assigning names to the dead. As of Saturday, the U.S.-based Human Rights Activists News Agency said it had confirmed 5,459 deaths and is investigating 17,031 more.