Authorities reported Tuesday that thieves stole Roman-era statues from the National Museum of Damascus.

The burglary occurred Sunday night and was discovered the next morning when a broken door to the classical department revealed the missing statues.

Officials told that six marble statues were stolen. An investigation is ongoing, and the museum is temporarily closed for authorities to assess the scene.

TIME has contacted the National Museum of Damascus, the Syrian Directorate-General of Antiquities and Museums, and local authorities for more details.

The museum reopened in January after the Assad regime fell the previous month, featuring enhanced security with new surveillance cameras. Although the museum remained open for most of the civil war, it briefly closed during the Assad government’s collapse due to looting concerns reportedly widespread in the Syrian capital during that turbulent period.

Rima Khawan, chief curator of the National Museum in Damascus, told AP at the reopening on Jan. 8, “Things happened so fast with the fall of the regime, creating some chaos. Thankfully, we did not suffer any serious damage… there was more fear than damage.”

The International Council of Museums (ICOM) reports that a black market for “cultural objects” has emerged in Syria over the past year.

ICOM warned in June that treasure-hunting devices are easily accessible in the country, leading to the public sale of illegally excavated items on social media, and a rise in counterfeit artifacts.

Before the Damascus Museum heist, ICOM urged “the relevant authorities in Syria and abroad to take decisive action to address this issue.”

Syria boasts a rich history predating the Roman era and is home to world heritage sites. This includes the ruins of Palmyra, a Roman city in central Syria largely by ISIS in 2015 when it controlled significant parts of the country.

Damascus is as a UNESCO site. The Syrian capital, one of the world’s oldest cities, contains an estimated 125 monuments built over 5,000 years.

The stated in January, shortly after the National Museum in Damascus reopened, that “Syrian heritage has faced numerous acts of vandalism, destruction, encroachments, theft of archaeological artifacts, and the degradation of archaeological layers at various sites.”

The Syrian landmark heist follows a high-profile robbery at the , three weeks prior, where thieves stole over $100 million worth of jewels.

Facing intense scrutiny and questions about how such a heist could occur at the home of the Mona Lisa, the Paris prosecutor’s office is actively investigating the case, and several individuals have been charged. The authorities have yet to recover the jewels.

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