According to the Syrian Observatory for Human Rights, an airstrike against an ISIS convoy over the weekend in the Hama Province destroyed 16 vehicles and killed at least 40 ISIS fighters, one of the most effective single strikes reported in weeks.

Details are still scant, and of particular interest is who launched the airstrike, whether it was the US coalition, Russia, or the Syrian Air Force itself. Hama Province has been the site of a major Syrian military offensive, and the US has taken Russia to task for strikes against Hama, saying there are no ISIS fighters there.

But the site of the strike isn’t totally clear either, and apparently wasn’t too far from the Raqqa Province border. This likely places the strike closer to Tadmur than to Hama, which is further east than the Syrian offensive’s focus.

ISIS has been trying to gain territory in Hama and Aleppo in recent months, having mostly wrapped up the Raqqa and Deir Ezzor Provinces, and mostly failed in moves against Hasakeh in the far northeast. So far they are known to have most of the area around Tadmur, along with the city itself and the ancient nearby city of Palmyra.