At least sixty people have reportedly been killed in Syria Thursday after a drone attack targeted a military academy graduation ceremony in Homs. 

The Syrian Observatory for Human Rights, citing sources, reported that "the number of deaths in airstrikes by unknown drones on the military school in Homs has exceeded 60."

"According to SOHR sources, nine civilians, including a woman and a little girl of the officers’ relatives, were among the deaths," it said. "In addition, 120 other people were injured, tens of whom sustained serious injuries."

Homs drone attack

A screenshot showing the aftermath of a drone attack in Homs, Syria.  (Reuters)

The source of the attack is unclear. Syria's defense minister attended the ceremony but left minutes before the strikes, a Syrian security source told Reuters.

Syria military parade in Aleppo

Syrian soldiers march in formation during a rally organized by President Bashar Assad's government in Aleppo in December 2017. A reported drone attack happened Thursday at a military academy in the city of Homs. (George Ourfalian/AFP via Getty Images)

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"After the ceremony, people went down to the courtyard and the explosives hit. We don't know where it came from, and corpses littered the ground," a witness who claimed to have set up decorations at the event told Reuters.

AFP also is reporting that Syrian state television is describing the incident as a "terrorist attack" and there are a "large number of casualties."