The Syrian Observatory for Human Rights (SOHR)says that that 57 were killed - all of them either Iranian or Iranian-backed militias.
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The most detailed account of the targets I could find comes from Deir Ezzor 24, and there were a large number of places targeted:
Warplanes, believed to be Israeli, targeted a number of Assad forces and Iranian militias' positions in Deir Ezzor last night, according to Deir Ezzor 24 network correspondent.Our correspondent said that the raids targeted positions of the Iranian Revolutionary Guard Militia (IRGC) in al-Thalath area of al-Bukamal badiyah eastern Deir Ezzor, positions of the IRGC and the 47th Regiment militias in Bir al-Hammar in al-Bukamal badiyah, and IRGC positions in al-Seiba area.The raids also targeted positions of the Zainabiyon militia on Hamdan airport road and al-Hajjanah Street in al-Bukamal city, positions of the Iraqi Hashd al-Shaabi militia about 3 km from al-Bukamal border gate, and a position of Hezbollah militia near Aysha hospital in al-Bukamal.In al-Mayadeen city, the raids targeted positions of the IRGC militia in al-Mazari'e area on the Deir Ezzor-al-Mayadeen international highway, and positions of Fatimiyeon militia near al-Makif and the vicinity of al-Rahba castle.In Deir Ezzor city and its surrounding, the raids targeted weapons depots of Fatimiyeon militia, military positions in Tal al-Hajif (the Radio station building), a position near the Faculty of Education in al-Omal neighborhood of Deir Ezzor city, a headquarters of the military security branch in Ghazi Aiyash neighborhood, posts near the military hospital, the water corporation, the perimeter of the automated bakery in Port Said Street, and the Tharda Mountains, and the regiment in the military airport and on the international highway.
SOHR adds an interesting detail: The city of Deir Ezzor is under Russian control.
But Russia has been tangling with Iran over control of the area, so it could be that the Russians were happy to see Israel destroy Iranian positions.