(BBC) – At least 15 civilians have been killed and dozens injured in an air strike on a village in eastern Syria held by so-called Islamic State, activists say. The DeirEzzor24 website reported that an unidentified jet had dropped cluster bombs on Dablan, about 20km (13 miles) south-east of the town of Mayadin. The UK-based Syrian Observatory for Human Rights put the death toll at 30. It comes only two days after a US-led coalition strike reportedly killed 42 detainees at an IS prison near Mayadin. The coalition confirmed it had targeted “IS command-and-control elements” in the area on Monday, but said the raid had been “meticulously planned” to avoid harming civilians.